48" Magnesium Multi-Trac Groover Blade 48" x 8" with 1/2" spacing. Half flat half grooved face 1/2" grooves on centers. Creates a clean sharp groove in most concrete finishing applications. Works with 4 hole brackets. No bracket included. Blade only. Build your Multi-Trac Groover for your concrete finishing application visit our large selection of bull float handle brackets and bull float extension handles.