Bosch Drill Bits & Parts Hammer drill bit 607735 - Bosch 2608685864, The Bosch SDS max-4 hammer drill bit is designed for drilling through stone, masonry, and brickwork. It features a 20x200x320 mm size and fits SDS-Max drill systems. This robust bit is ideal for construction applications requiring precision and durability in hard materials. Bosch 2608685864 SDS max-4 Hammer Drill Bit 20mm Concrete Steel Durable