Material: HSS M35 Cobalt 5%. Angle Point: 135 Degree. Shank Type: Straight Shank. All woodworkers need this set. 29 pieces are included for you to choose the most appropriate one, and it comes in a portable case. And all drills can be used for cutting metal, plastic, wood, etc. HSS M35 with 5% Cobalt provides ultimate higher heat and abrasive resistance which ensures a longer service life. 29 PIECES INCLUDED: 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″, 17/64″, 9/32″, 19/64″, 5/16″, 21/64″, 11/32″, 23/64″, 3/8″, 25/64″, 13/32″, 27/64″, 7/16″, 29/64″, 15/32″, 31/64″, 1/2. HSS WITH 5% COBALT: Durable, Higher Heat & Abrasion Resistance. PRECISE 135°SPLIT POINT & TWIST DESIGN: Prevent walking, clear chips and particles faster. PROFESSIONAL & WIDELY USE: M35 Cobalt HSS is more suitable for hardened material. Particularly successful in cutting through hard metals such as stainless steel, cast iron, high temperature alloy, titanium alloy, hard plastics and woods, and also can be used for softer materials. ORGANIZED HOLDER: Set includes the drill bit holder with size index for easy storage and organizing.