This 12mm x 940mm pro sds max-4 bit pack of 1 is the smallest diameter in the range, with long length for reaching deep in reinforced concrete. The 4-cutter head helps it cope with rebar. Features and benefits: up to 1.5X longer life than a bosch sds max-2 bit 4-cutter head resists jamming and breaking on rebar tungsten carbide for strength and durability deep flutes clear dust and chips effectively fits all sds max rotary hammers specifications: diameter: 12mm length: 940mm pack quantity: 1 contents: pack of 1