tender for cordless underwater hand hammer drill go through the quotation request , cordless underwater hand hammer drill: hammer drill is designed to drill into cement, brick, and stone, both on land and underwater. it should be easy to handle by commercial, research, and recreational divers and suitable for a variety of tasks in the saltwater. should be operated minimum up to a depth of 50m. impacts per minute ( on high speed ) : 0-21000 ipm. batteries: two 18v 6ah lithium-ion batteries. it should comes with a durable carrying case, battery charger, pressure valve, and a pump to pressurize the drill. one more set of spare batteries of same specification also be provided. no. load speed ( 2 speeds ) : 0-1500 rpm. maximum torque: 30 n / m ( 266 in. lbs ) . chuck size: minimum 13 mm ( 1 / 2 in ) . accessories: all different size drill bits set, compactable to the driller.