This right handed through hole boring bit has a 5mm diameter and a 45mm cutting depth. The shank is 10mm in diameter with a 20mm length. The shank also has a driving flat and a length adjustment screw. Carbide tipped through hole boring bits are designed to drill completely through the wood and produce clean dowel holes while eliminating break out. The smooth non-stick coating helps the wood chips slide up the bit and out of the hole while drilling. 10mm shank with driving flat and length adjusting screw.