attacker multipurpose staple gun tacker, uses t-20 staples, 205 - 5/16" (tv# 444-573), 206 - 3/8" (tv# 444-585) & 208 - 1/2" (tv# 444-623). also uses t-25 staples, 256 - 3/8" (tv# 699-785), 257 - 7/16" (tv# 699-793) & 259 - 9/16" (tv# 699-801).