Flat laps / Comparison
All-U-Need Rock/Mineral vs. Glass/Crystal Kits
Compare the actual disc sequences, backing plates and polishing supplies before choosing an All-U-Need package.
Research-based guide · We have not physically tested these products. How we research
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THE SHORT ANSWER
Choose the All-U-Need kit by the work you plan to do. The rock/mineral package combines a coarse plated lap with smoothing discs; the glass/crystal package supplies a different plated-disc sequence. The key distinction is the abrasive kit, alongside the selected six- or eight-inch size and voltage.
| Component | Rock/mineral package | Glass/crystal package |
|---|---|---|
| Plated grinding abrasives | 180-grit electroplated lap | 360, 600, 1200 and 3000-grit electroplated discs |
| Smoothing discs | 325, 600 and 1200 grit | Not listed as the mineral-style smoothing sequence |
| Polish provision | Tech-11 pad and 2 g of 14,000-grit paste | Tech-11 pad and 2 g of 14,000-grit paste |
| Backing plates | Four acrylic plates | Two acrylic plates and a disc bushing |
| Machine options | 6 or 8 inches; voltage selection | 6 or 8 inches; voltage selection |
The question the kit names are answering
The manufacturer directs mineral and rock work toward the rock/mineral model and cold glass work toward the glass/crystal model. These labels describe the intended supplied abrasive systems, rather than two unrelated machine layouts. Both product pages describe the All-U-Need platform and its size choices.
Decide on your first repeatable project before choosing the package. Domed mineral cabochons, flat mineral faces and glass-edge work do not necessarily call for the same surface support or abrasive behavior. If your work spans several materials, send the manufacturer a short project list and ask which kit and additional components it recommends.
Why the rock/mineral kit includes smoothing discs
The listed mineral package starts with a 180-grit plated lap and then uses 325, 600 and 1200-grit smoothing discs. A polishing pad and paste provide the final supplied polishing provision. That tells you what arrives, but it does not establish a universal recipe for every stone.
The smoothing-disc numbers should not be treated as direct equivalents of plated-disc numbers. The manufacturer’s FAQ explains that abrasive construction affects the resulting scratch behavior. Do not replace a stage solely because the same number appears on a different type of disc. Read the disc buying guide for the mounting and construction distinctions.
Why the glass/crystal package looks different
The glass/crystal listing supplies four plated diamond discs: 360, 600, 1200 and 3000 grit. It also lists a Tech-11 pad, paste, two backing plates and a disc bushing. That differs from receiving a separate permanently mounted backing plate for every abrasive in the mineral package.
Compare the exact current included-items list rather than infer contents from a staged photo. Ask how the nonpermanently mounted discs are centered and retained on your selected machine. Do not assume a pile of discs in a photo includes one plate for each disc or an extra machine accessory.
Shared specifications do not settle the abrasive choice
The manufacturer describes a quarter-horsepower variable-speed motor, a half-inch arbor and speeds from 800 to 3400 rpm. Both sizes still require the correct disc diameter, mounting components and operating limits. A matching hole does not establish that any third-party lap can be installed.
Size and kit should be recorded as separate order fields. An eight-inch glass kit and a six-inch mineral machine are not a useful compatibility combination simply because their arbors share a nominal size. Confirm the complete diameter-specific stack and available clearance with the manufacturer.
Can you buy a second kit later?
Separate disc kits are listed by the manufacturer, which makes a staged purchase worth investigating if your work expands. Price the complete conversion rather than just the visible abrasive sheets: plates, centering components, polishing materials and storage may also matter. Ask whether the chosen kit suits your exact machine revision.
There is also an important listing distinction: the separate rock/mineral disc kit lists smoothing discs and polishing supplies; its component list does not include the machine package’s coarse 180-grit lap. Do not assume a replacement disc bundle duplicates every item shipped with a new machine.
Keep abrasive stages and polishing supplies identifiable
Label and store components by material and stage as appropriate to the manufacturer’s instructions. Abrasive contamination can frustrate a comparison between kits, because a later-stage mark may have arrived with debris rather than from the intended disc. Cleanliness and inspection remain part of the workflow.
We have not tested either kit on glass, agate, quartz or any other material. We cannot rank their polish quality or report a number of finished pieces per disc. Treat broad durability and finish statements on product listings as manufacturer claims rather than our measured results.
Order checklist and recommendation
Confirm machine diameter, voltage, included abrasives, backing-plate count, bushing and polishing supplies. If you already own an All-U-Need, compare the second kit with replacing only the stages you lack. A complete new kit can be convenient, but duplicated components may not add useful capability.
For mineral cabochon plans, begin the conversation with the rock/mineral package. For cold glass work, begin with the glass/crystal package. For broad flat surfaces or mixed work, get a material-specific recommendation before paying. If your uncertainty is horizontal versus angled layout, use our separate All-U-Need versus Slant Cabber comparison.
Sources and verification
Manufacturer and specialist-supplier pages checked October 21, 2026. Specifications can change; the current manual and seller confirmation govern the exact order. Recommendations are editorial judgments about documented fit. We have not physically tested the products.
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