a general recommendation is the larger diameter of the core drill being used

2 x 9/16-NC12

Up to 15 minutes of run-time on high

Features: Especially developed robust head geometry with optimum 4 x 90 ° symmetry of carbide tip: Reduces jamming up on hitting reinforcing steel

18V 180mm Brushless Rotary Polisher Bare (Tool Only) DCM849N-XJ by Dewalt Ankascrew Wercs a general recommendation is theFeatures: Brushless Motor delivers improved performance in demanding applications Variable speed dial allows for easy speed changes to suit specific applications Variable speed trigger allows for additional speed control by adjusting the force applied to the switch Rotated battery foot keeps rear of the tool away from the work surface preventing accidental contact or scratches Lock on trigger switch allows continuous fatigue free operation Ergonomic