Surface prep goes wrong in two directions: too coarse and you gouge the slab, too fine and you polish the coating instead of removing it. The EDCO QC1B-HC-0120 Single Dyma-Dot is the fine end of that range -- a 120-grit quick-change diamond dot for hard concrete that smooths and refines a slab after the aggressive passes are done, without cutting a divot into it.
The magnetic quick-change backing is what makes it practical on a job. It seats on EDCO Magna-Trap multi-accessory discs on both 7-inch and 10-inch machines, so a crew can step through grits or swap between grinding and polishing tooling in seconds rather than unbolting hardware on the floor. Hard concrete bond means the matrix is formulated for slabs with lower abrasive aggregate content, where a harder bond would glaze over and stop cutting.
Use Cases
- Refining a slab after coarse grits, ahead of coating, sealer, or polish
- Removing thin residual epoxy, mastic, and weather-proofing membrane left after aggressive passes
- Leveling and smoothing concrete without gouging on hard, low-aggregate slabs
- Stepping a floor through a grit sequence on EDCO Magna-Trap turbo and floor grinders
- Producing a Concrete Surface Profile suitable for thin-film coating adhesion
Matching grit to the job
Lower grits cut fast and leave a deeper profile; higher grits like this 120 refine what the lower grits left. A typical sequence moves from an aggressive removal grit up through the range, with each step erasing the scratch pattern of the one before it. Skipping steps is the most common reason a finished floor shows swirl under a coating.
Specifications
- Type: single Dyma-Dot quick-change diamond grinding dot
- Grit: 120
- Bond: hard concrete
- Attachment: magnetic quick-change backing
- Fits: EDCO 7-inch and 10-inch Quick-Change multi-accessory discs, Magna-Trap floor and turbo grinders, and classic grinders retrofitted with a Magna-Trap multi-tooling disc
- Concrete Surface Profile (CSP) rating: 2
- Part number: QC1B-HC-0120
Frequently asked questions
What does the hard concrete bond mean?
Diamond tooling bond is matched to the slab, not the machine. A hard concrete bond uses a softer matrix that wears at the right rate on dense, low-aggregate concrete so the diamonds stay exposed and keep cutting.
Which machines does this fit?
It mounts magnetically to EDCO Quick-Change multi-accessory discs on 7-inch and 10-inch machines, including Magna-Trap floor and turbo grinders and classic grinders retrofitted with a Magna-Trap multi-tooling disc.
What is 120 grit good for?
Refining. It smooths and levels after coarser grits have done the removal work, and it prepares the slab for a coating, sealer, or further polishing steps.
What is a CSP rating?
Concrete Surface Profile is the ICRI scale that describes how rough a prepared slab is. This tooling produces a CSP 2 profile, which suits thin-film coatings.
Do I need a full grit sequence?
For a finished floor, yes. Each grit removes the scratch pattern left by the previous one. Jumping several grits at once usually shows up as swirl or haze in the final surface.
How is this different from a double Dyma-Dot?
Single dots present less diamond surface to the slab, which concentrates pressure for a more aggressive cut per dot. Doubles spread the load for a smoother, longer-wearing pass.
Discount Cleaning Products is an authorized dealer, and every order is backed by US-based product support from people who work with this equipment every day. Call or email us for sizing, compatibility, or bulk questions before you buy.
