29 Piece HSS Black & Gold KFD Split Point Mechanics Length Drill Bit Set, 1/16" - 1/2"Product Description Mechanic length drills are manufactured from premium grade high speed steel, Killer Force Drills (KFD) have a heavy duty 135 split point for self centering and reducing thrust. Gold and black surface treated for use in stainless steel and other hard metal drilling. Sizes 3 16" and larger have a 3 flat shank Brand Drill America Part Number KFD29ML SET Size Set Material High Speed Steel Finish Black and Gold Pieces in Set 29 Point