powernail model ht750 19ga 15/32" crown hammer tacker powernail the ht-750 hammer tacker is an all-purpose heavy duty tacker primarily used for the installation of carpet padding. it features fast bottom-loading and a quick-clear jam release. this tacker is designed to use 9/16′′, 1/2′′, 3/8′′ and 5/16′′ 7500 series powerstaples.