Expert SDS plus-7X Hammer Drill Bit for Rotary Hammer Drills The Bosch 2608900131 is an SDS plus-7X Hammer Drill Bit, part of the Expert Range. It has a 16mm diameter with a 200mm working length and an overall length of 265mm. 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: 16.0mm Working length: 200mm Total length: 265mm