With rotary and rotary percussion action and 22 500bpm impact rate. Torque limiter and long side handle protect the operator. Supplied with carry case. User Benefits: Heavy duty construction - ideal for site work. Percussion action for drilling pilot hole. Rotary action for dry diamond core drilling. Torque limiter to prevent operator injury if the core bit snags. Excellent for plumbers electricians general contractors hirers. Included in the BP-10048 BAP Electricians 7 Piece 2 CORE Diamond Core Set for Granite Marble + Metal Case BAP Trade Diamond core drill bits have been manufactured for heavy duty applications through tough construction materials, including brick, masonry concrete. Thse core bits feature highly concentrated diamond particles and premium grade solid steel barrels, for increased drilling speed and extended lifetime. For use with drills with a motor of at least 850W for heavy duty drilling applications. Ideal for medium-hardness brick, concrete blocks, hard sandstone, coarse sandstone, soft slate, breeze block, lignacite blocks. Kit contains: 152 and 107mm Cores ideal for ducting pipes, extractor fans, 152mm for extractor fans, heat recovery vents etc. This 7 piece Diamond Core set it suitable for cutting, Granite, marble, limestone, slate, hard bricks and other dense and non-abrasive materials. Encompasses the industries most popular core sizes to suit Electricians, Plumbers and other major trades Laser welded diamond cores are designed for fast and easy drilling, in the most demanding of situations. Trade quality and fully compatible with Makita, Dewalt, Bosch and Milwaukee core drills Includes 2 x Core Drills 5 x Accessories 1 x Aluminium carry case with foam insert