9/16" HSS Black & Gold 1/2" Straight Shank Bridge Reamer BoltsandNuts.com and 1/2 inch drive ratchets

and 1/2 inch drive ratchets have a 90-tooth gear that produces a working swing arc of 4 degrees

Part Number DEWCBR63/64

Part Number D/ARSD39/64

and more secure hold

Part Number DWRRB1-1/8HEX

9/16" HSS Black & Gold 1/2" Straight Shank Bridge Reamer BoltsandNuts.com and 1/2 inch drive ratchetsProduct Description Also called Construction Reamers, Bridge Reamers are used to align existing holes prior to bolt or rivet installation. Black and gold surface treated for use in stainless steel and other hard metal drilling. The point is tapered to permit entry into overlapping holes. It's short length facilitates use in areas with limited access. The reduced 3 flat shank provides positive grip in portable electric and pneumatic tools. Brand Drill