HILTI DIAMond core drill DD 250 / 110v. Advanced heavy-duty diamond core drill with optional Cut Assist automatic feed unit for. Drilling very small to large diameter holes of 12-500 mm (1/2″ – 20″). Diameter range: 12 – 500 mm. Base material: Concrete, Reinforced concrete, Asphalt. Mode of operation: Stand drilling system. Heavy-duty, air-cooled engine – core drill built for high performance, with rugged construction and convenient controls. Extremely wide range of diameters – four-speed transmission for use with most chainring sizes. Easy hole start function – low speed mode with low vibration, for starting drilling with large core bits. Hilti Cut Assist – equips the core drill for fully automatic cutting. It starts when the surface is detected, then optimizes the speed and flow of water continuously, even when cutting rebars. Cut Assist means much higher productivity and more time for other tasks (optional auto-feed unit DD AF-CA H required). Real-time information display – digital levelling, gear selector, power control function, detailed usage statistics and easy-to-understand service messages. Core drilling for openings for ducts, pipes and cables. Core drilling of blind holes for fixing post-installed anchors or reinforcing bars. Holes for serial demolition. Assisted drilling of large quantities of holes with the DD AF-CA H automatic feed unit. Assisted drilling of deep holes and extremely large diameters with the automatic feed unit DD AF-CA H. Diameter range : 12 – 500 mm. Basic material: Concrete, Reinforced concrete, Asphalt. Operating mode: Perforation system on support. Number of gears : 4. Gear 1: 240 rpm; gear 2: 580 rpm; gear 3: 1160 rpm; gear 4: 2220 rpm. Weight without battery as per EPTA Procedure 01/2003: 15.4kg. Complete system weight: 37kg. Dimensions (WxDxH): 630 x 190 x 215mm. Sound pressure level (A) measured: 93 dB (A) 1. Vibrate water-based diamond crown (ah, DD): 2.5 m/s².