Drill Bit Set? :115 sets of drill bits include 29 fractional sizes 1/16″-1/2″ by 64ths; 26 letter sizes A to Z; 60 numbered wire gauges 1 to 60 with a metal storage case. This 115 PCS M35 twist drill bit set meets all your needs? Features of M35 Cobalt? : M35 cobalt drill bit set can effectively drill rigid and high-tensile strength materials. The drill bit is especially suitable for cutting hard metals, such as stainless steel, cast iron, super alloys, titanium alloys, rigid plastics, and wood. It can also be used in soft materials? 118 Degrees Point? : Cobalt drill bit set can be effectively used for most hard and soft objects, 118 degrees point nib and twist design, improve cutting speed, self-centering, prevent walking, and speed up the removal of debris and particles? HSS Drill Bie Sets? : HSS cobalt drill set is suitable for hardened steel and has excellent cutting performance. 115 sets of drill bits can be used for a long time. The blades are hardened and polished to improve sharpness, and precise cutting does not shake. Can make your cutting process appear so efficient and simple? Packaging? : The cobalt drill bit set includes a drilled rack with a size index, which is convenient for storage and organization. The drill set is suitable for most brands on the market. Reliable quality and considerate service.