Milwaukee Drill Bit Set 58-Pcs Cobalt Red Helix Design Power Tool Accessory. QUADEDGE TIP decrease heat build up for faster drilling. RED HELIX for rapid material extraction. ENHANCED TAPERED WEB increases flute durability & core strength. The Milwaukee RED HELIX Cobalt 58-Piece Drill Bit Set is engineered for extreme durability and longer life in hard metal applications. The Milwaukee Cobalt drill bits are designed with a VARIABLE HELIX that includes an aggressive 35° Helix Angle which ends at 15°. The drill bits have QUADEDGE TIP to decrease heat buildup and drill faster. The 135° split point tip delivers a precision start and prevents walking for fast, accurate holes in Hard Metal, PVC and wood. The tapered drill bits feature a new ENHANCED TAPERED WEB that strengthens the bit’s core to increase flute durability. The cobalt twist drill bits are ideal for tough applications, providing up to 15 x life versus Black Oxide Drill Bits. This set includes 23 bits from 1/16 in. Drill Bit Type: Twist. Drill Bit Type(s) Included: Twist. Features: No Additional Features. Material Application: Duct/Sheet Metal, PVC, Wood. Number of Pieces: 58. Tools Product Type: Other.