Alpen Series 875 Force X SDS 4 Flute Masonary Drill in Plastic Wallet L=450 400, ? 32.0 Backing Plate Useful for both alignment and Punches tip diamerer 3 Useful for both alignment and for measurement purposes Mitutoyo proprietary new design permits smooth pointer operation Flat crystal makes graduations easy to read Strong frame provides excellent rigidity and durability Non magnetic pointer and contact point permit reliable operation even in magnetic environments Clear and concise wide dial face allows excellent visibility The surface of the crystal is hard coated for excellent scratch resistance O ring protection guarding against oil and water penetration 5 8" x 62mm reinforced concrete SDS plus high performance drill bit with 4 tungsten carbide cutting edges and new progressive spiral design with dowel length indicator