Grip-CapA Plast-Cap NailAlready assembled with a ring shank nail. Round plastic insulation caps. Used for fastening foamboard, roofing felt, insulation, house wraps, film, etc. Bulk box.No. GC1: Length: 1 IN, approximately 313 nails per lb.No. GC112: 1-1/2 IN, approximately 231 nails per lb.No. GC134: 1-3/4 IN, approximately 206 nails per lb.No. GC2: 2 IN, approximately 185 nails per lb.No. GC212: 2-1/2 IN, approximately 128 nails per lb.