The Stinger 1 in. Nail Pac contains 10 rolls of 200 collated plastic caps and 10 coils of 200 nails. NailPac contains 1 in. collated caps and 1 in. nails. Cap nails are a recommended best practice for securing roofing underlayments of felt and house wrap where nails are required. The 1 in. NailPac is for use with the Stinger CN100B Cap Nailer only.