High Quality Material – Premium High Speed Steel M35 (Cobalt 5%) provide extended tool life compared to ordinary drill bits when drilling hard materials. Characteristics – 135° split point with round straight shank, self-centering prevent walking, make drilling precise and faster. Fully Ground twist design helps clear particles faster, decreases friction and heat for a cooler drilling performance. Widely Used – M35 Cobalt High Speed Steel is more suitable for tough, high tensile strength material. Particularly successful in cutting harden metals such as stainless steel, cast iron, high temperature alloy, titanium alloy, hard plastics and woods. Specifications – 115pcs includes 29pcs fractional size 1/16″-1/2″ by 1/64 Increments, 26pcs letter sizes A to Z, 60pcs numbered wire gauges #1 to #60. Organized Holder – The whole drill bit set are kept in one metal case with size index holder for easy storage and organizing.