Bosch 2608685865 SDS max-4 Hammer Drill Bit For Masonry 20 x 400 x 520mm The Bosch 2608685865 SDS Max-4 drill bits are best suited to drilling concrete and masonry. They feature a 4-cutter design which prevents jamming when drilling rebar and a 2-flute U-shape which provides good dust removal. This model is compatible with all rotary hammers with an SDS max holder and is extremely durable thanks to its carbide construction. Features: 4-cutter design ensures prolonged use with no jamming when drilling rebar 2-flute U-shape also lengthens life while offering good dust removal Durability is further secured via the bit´s highly durable carbide, which resists wear Ideal for use in concrete and masonry Compatible with all rotary hammers with SDS max holders Specification: Diameter: 20mm Working length: 400mm Total length: 520mm