Additional Drilling Equipment - New out of box. This is the Pilot bit only 7 Diameter (Patent Pending) Extra Heavy Duty Bullet Tooth Pilot Bit That Has Qty 6 HD 31 1/2 Diameter Carbide. 4140 Special Alloy Thats Through Hardended To Assure Toughness. Location: Salt Lake City, Utah. For complete listing information please select the Click To Bid button to see this item on eBay.