Bosch 2608685863 SDS max-4 Hammer Drill Bit For Masonry 18 x 400 x 540mm The Bosch 2608685863 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 bits highly durable carbide, which resists wear Ideal for use in concrete and masonry Compatible with all rotary hammers with SDS max holders Specification: Diameter: 18mm Working length: 400mm Total length: 540mm