Description Not for Marine Applications. Stainless steel to resist rust. Use With: Arrow staple or staple/nail gun Nos.ET50, ETC50, ETF50BN, ETF50PBN, ETFX50 (307.9233), ETN50), T50 (647.9125), T50OC, T55 (647.8093), in hammer staple/tacker No.HT50 (688.1007), in brad nailer/staple gun No.T50PBN (696.5909), and in tacker gun No.T55C.