SDS max-4 Drill Bit is equipped with a 4-cutter head and delivers long lifetime in concrete. 4-cutter design ensures prolonged use with no jamming when drilling rebar. 2-flute U-shape also lengthens life while offering good dust removal. Fits all SDS max rotary hammer drills. Diameter (D) mm: 22, Working length (L1) mm: 400, Total length (L2) mm: 520.