Bosch 2608900069 Expert SDS plus-7X Hammer Drill Bit 5.5 x 250 x 315mm The Bosch 2608900069 is an SDS plus-7X Hammer Drill Bit, part of the Expert Range. It has a 5.5mm diameter with a 250mm working length and an overall length of 315mm. Bosch Carbide Technology gives 3 times longer working life than a standard drill bit. Features: Long Life Drilling Reinforced Concrete Extremely durable drill bit tip with Bosch Carbide Technology Punch through reinforced concrete with a 4-cutter Full Carbide Head Fits all SDS plus rotary hammer drills Specification: Diameter: 5.5mm Working length: 250mm Total length: 315mm