... hammer drill bits- Electronic switch for better drill precision - Rotary-only drilling mode for drilling in wood, drywall panels and ... :- Daily hammer drilling in concrete, masonry and natural stone; diameter range 4-22 mm- Drilling in wood, drywall panels and ... with precision hammering action in perforated brick, tiles and marble; diameter range: anchor holes 4-22mm; cutting sockets 25-68 ...