12 in. x 9 in. 1 in. bit  5/8 in wide and 1/4 radius Concrete Walking Power Groover Without Handle groover makes smooth consistent grooves in concrete slabs. 2-Way clevis adapter accepts both long and short clevis handles. Rivet free design ensures clean control joints every time. Cuts sharp clean grooves. Broken-in front and back. Bits are curved in front and back. No Handle.