Safety Mechanism prevents accidental firing. Quick release magazine for easy loading. Adjustable air exhaust, stapler viewer. 100 staples capacity, 60 to 100 psi pressure rating. Dimension of 8.1 in L x 2.2 in W x 8.9 in H. Tool weighs 2.9 lb. Fastener drives 1/4 in thru 9/16 in Surebonder #4 heavy-duty staples (same as arrow T50), 1/4 in, 5/16 in, 3/8 in, 1/2 in and 9/16 in staple lengths. Includes high-impact carrying case.