For Use on Carpet Padding, Insulation, Roofing Paper, House Wrap . Specifications: Weight: 2 lbs. 4 oz.; Dimensions: 3" H x 11" L; Fastener Range: 5/16" to 3/8"; Wire Gauge: 20; Wire Size: .05"; Crown Width: 15/32"; Load Capacity: 168. Mode of Operation: Manual. Uses A11 Fasteners