#10 wood Countersink. This product is highly durable. This product is manufactured in China. Tapered drill with widened flutes for drilling fast, clean pilot holes and ensures tight fit for screws. Adjustable four-cutter counter bore cuts and clears chips quicker for fast, smooth countersinking. Counter bore attaches to flats on shank with two hex screws for a secure fit and can be adjusted for controlled pilot hole depth. 1/4" quick-change shank reduces slipping in standard chucks and is compatible with all 1/4" quick-change chucks, including impact drills.
The hex screwdriver on this tool turned on the shank where it connects to the chisel. This is not a hex wrench connection. Like it wasn't properly fused or pressed in. It was on first use. garbage
I've been building cases for 22 years now. completely removed from both instruments. Now expect a little better quality from Irwin. I will NEVER EVER buy another Irwin instrument and make sure the big hospital my nephew works at stops buying Irwin instruments too!