The Arrow Fastener 5/16-inch genuine thin-wire staples are designed for use in T30 staple guns and HT30 hammer tackers. Made in the USA, the staples measure 5/16-inch (leg length) by 1/2-inch (crown size). Pack of 5040. For use in T30 (2750-0842), T32, T32M, HT30 (2750-0842) hammer tackers.