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. Includes BP-10047 BAP Plumbers 8 Piece 3 CORE Diamond Core Set Brick 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,