For drilling large diameter holes in concrete Heavy duty three speed diamond drill, rig mounted Powerful motor & mechanical gearbox Dust free diamond drilling with vac Water feed for drilling reinforced concrete Quick release clamp for use with drill rig PLE450.1 is a powerful diamond drilling unit with a heavy duty three speed gearbox The drill is used with water feed for drilling reinforced concrete A quick release clamp is supplied for use with drill rig Max drilling with rig in concrete 452mm.