• Highlight: The MK Diamond GC-20 is a 6-3/8 inch early-entry blade tuned for hard aggregate, cutting green-concrete control joints before a slab can shrink and crack.
• Best For: Flatwork crews making early-entry control-joint cuts on freshly placed slabs, driveways, and sidewalks.
• Expert Note: Matching bond to hard aggregate is what extends usable life; the GC-20's harder-rated segment resists glazing in dense, abrasive concrete mixes.