Stanley-Bostitch ROOFKIT1 Roof Nailer & Cap Stapler Kit - Wide Crown Uses wider 5/16" crown staples that help prevent puncture to the cap. Adjustable depth guide sets staples to desired depths quickly and conveniently. Light weight aluminum design for added durability. Specifications: Weight: 4.7 lbs. Driving power: 300 inch lbs. at 100 PSI.