This 36" long roller tamp prepares the surface of a slab for a smoother finish

ball bearing wheels

and striking off concrete

a special feed roller

wide groove

U-Shape Grooving Blade 3.5MM (10 pack) diamond disk This 36" long roller tampU Shape Grooving 3. 5MM Blades for Pull Groover. Includes a ten pack of 3. 5mm standard profile U Blades that fit the Pull Groover and other popular hand groovers. The blades are ground on the front and back sides to produce two grooving edges. They are made from high carbon steel, then hardened and ground to produce sharp, long lasting edges. A durable 10 pack clear plastic container snaps closed for storage.