The BOSTITCH BTMT72394 Air Chisel Hammer features 3000 beats per minute and a 1/4" air inlet. It has a medium barrel design for automotive applications, and accepts standard .401" chisel shanks. The aluminum body is great for durability in rugged work conditions. It has a rubber cushion grip for comfort and to help absorb shock, along with a touch control trigger for speed control. Also includes 3 chisels.