The Stinger CH38 Cap Hammer is the first hammertacker to deliver a cap and staple, the maker says. Pulling the trigger advances a 1-inch cap, then when used like a standard hammertacker, the cap and a 3/8-inch staple are fastened simultaneously. Ideal for housewrap and roofing underlayment, cap fasteners are an installation best practice to help seal out moisture that penetrates side walls. 800.968.6245.