Bits with Quadro-X feature an extra strength tip for longer life and faster drilling. Updated tip and head provides 15 percent faster removal rate and 30 percent longer life. The 4-cutter head is fast with accurate drilling and true round holes for anchors. 11/16 in. diameter x 16 in. usable length x 21 in. overall length.
Best Price: 58.87 USD at Tool King