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.