Description: Premium Material: This 13 cobalt drill bit set is made from premium M35 cobalt material, which extends the tool's lifespan compared to ordinary drill bit when drilling hard materials.Unique Features: The Twist Drill Bit Set features a 135 split point tip and straight shank for self centering and preventing walking, ensuring and quick drilling. The fully ground twist design helps clear particles faster, reducing friction and heat for cool drilling performance.Versatile Use: Twist Drill Bit are more suitable for tough, high tensile strength materials. It is particularly successful in cutting hardened metals such as stainless steel, cast iron, high temperature alloys, titanium alloys, hard plastics, and wood.Specifications: This 13Pcs includes drill bit of the following sizes: 1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/32",11/64",3/16",13/64",7/32",15/64,1/4".Package Contents: The package includes a total of 13 of these versatile drill bit that cater to various drilling needs across different materials. Specification: Material:M35 Cobalt Color: Silver Package Includes: 13 Twist Drill Bit Note: Please allow slightly errors due to manual measurement and different monitors.