Ivy Classic, 04190, 13 Piece Cobalt Steel - Withstands abrasion and heat generated by hard-to-machine metals. Contents: 1/16" through 1/4" by 64ths. Precision ground, gold finish. For Stainless & Hard Steels, Wood & Plastic. 135 Split point for fast penetration and accurate self centering. Retains hardness at high temperatures. Sturdy metal cases with hinged index. Bits clearly visible with sizes marked on case.