happybuy 10''/255mm diamond core drilling machine 4450w wet dry diamond core drill rig for concrete drilling boring (drill bit dia:4.25"/108mm) happybuy </br>this is designed for diamond core drilling. this drill will cut up to 255mm(10 inch) holes in reinforced concrete, brick, stone, rock, ceramic, and fireproof materials. drill features safety clutch and overload protection. the core drill is fitted with a personal protection switch and stand base. the cooling water connection also makes it works more sturdily. the drill is fitted with a safety clutch. </br>features: </br>personal protection switch </br>adjustable bracket </br>cooling water connection </br>handled by a crank easily </br>4450w infinitely variable speeds </br>non water seal cage reduce maintenance costs </br>secondary hardening gears more durable & powerful </br>material lighter and steadier </br>item specifications: </br>max drilling diameter: 10"/255 mm </br>rated input power:4450w </br>rated voltage: 110v </br>rated frequency: 50-60hz </br>speed: 850 rpm </br>package included: </br>1 x 255mm driller </br>1 x diamond bit(?108mm/4.25inch) </br>1 x box spanner </br>1 x monkey wrench </br>1 x air tube </br>4 x carbon brushes </br>5 x screws </br>1 x english manual