Hss Center Drill (Bs-329-11/1980) 1/8'' X 5/16'' , Hsscenter Drill (Bs-329-11/1980) ¼ '' X 5/8'' , Hss Centerdrill (Bs-329-11/1980) 5/16'' X 3/4'' , Center Drill¼ '' X3/32'' , Center Drills 1/16'' X 3/16'' , Center Drill 3/16''X 7/16'' Quantity: 1600