Kraft Stainless Steel Walking Groover 8 X 8 CC021-01Makes 3 4 In. deep groove Creates 1 2 In. radius to prevent chipping of concrete Turned up sides to move smoothly through concrete Cuts control joints in concrete Single piece bit for clean grooves Closed bit prevents build up in tool Reinforced back plate for strength Rivet free blade for a smooth finish To use this groover with bullfloat handles, use GB021 Knucklehead or K cc687 multi twist 6 hole bracket and K cc689 Multi twist adaptor. Weight 1. 5