Irwin 4-Piece Wood Countersink Bit Set Cleaners & Primers 1/2" external male pipe threads

1/2" external male pipe threads & 1/2" internal solder connection

Tough-Cut octagonal boron-carbide shackle is 50% harder than hardened steel

fiberglass insulation

Length 10"

Irwin 4-Piece Wood Countersink Bit Set Cleaners & Primers 1/2" external male pipe threadsReplacement tapered drill bits with widened flutes for drilling fast, clean pilot holes. Adjustable 4 cutter counterbore cuts and clears chips quicker for fast, smooth countersink or counterbore drilling. Attaches and adjusts with 2 hex screws. Counterbore attaches to flat on shank for a more secure fit. Adjustable stop collar attaches to counterbore for controlling countersink depth. 1 4' quick change shank reduces slipping in standard chucks and is