2-1/4'' Zig-Zag Turbo Dry Core Bit, Paragon Diamond Tools, Mfr#: CBDZZ2.25

2-1/4" Zig-Zag Turbo Dry Core Bit; Our dry diamond core bits feature turbo segments with alternating (zig-zag) inner and outer points for a sure grip to reduce "walking" on the wall.