Safety Mechanism prevents accidental firing. Quick release magazine for easy loading. Adjustable air exhaust, stapler viewer. Specs: 100 staples capacity, 60 to 100 PSI, H-8.9" x L-8.1" x W-2.2". Tool Weight: 2.9 lbs. Fastener Specifications: Drives 1/4" thru 9/16" Surebonder No.4 Heavy-Duty Staples (same as Arrow T50), 1/4", 5/16", 3/8", 1/2", 9/16" Staple Lengths. Includes: High-Impact Carrying Case.