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. 15 PIECES 1/16″-3/8″. 21 PIECES:1-16:-1/4. 29 PIECES:1-16:-1/2. COMOWARE COBALT DRILL BIT SET. 4.5 out of 5 stars. 16″ -1/2″, A to Z, #1-#60. HSS WITH 5% COBALT.