Makita Drill Bits & Parts Hammer drill bit 632901 - Makita D-33962, Makita's D-33962 hammer drill bit features an 18 mm diameter and a total length of 540 mm with SDS-Max fitting. It is expertly designed for drilling into stone, masonry, and brickwork. This high-performance bit is ideal for heavy-duty applications. Makita D-33962 Hammer Drill Bit 18mm 540mm SDS-Max 2-Cutter 1 piece