Cobalt alloy-coated bits drill through the hardest materials like stainless steel while cutting faster and drilling cleaner. Cobalt coating lasts longer than HSS and titanium-coated bits. 1/2in. shank. Includes case. Includes (qty.): 12, Case Included: Yes, Size: 17/32in., 9/16in., 19/32in., 5/8in., 21/32in., 11/16in., 23/32in., 3/4in., 13/16in., 7/8in., 15/16in. and 1in., Finish Type: Cobalt Alloy Coated