Arrow Fastener T55 Easy Squeeze Staple Gun An excellent, all purpose tacking tool for the do-it-yourselfers Safety handle lock Loads 6 full sizes and Ceiltile staples Uses 1/4" 504 (2750-0719), 5/16" 505 (2750-0735), 3/8" 506 (2750-0750), 1/2" 508 (2750-0776), 9/16" 509 (2750-0792), and 17/32" 50CT Ceiltile (2750-0818) heavy .050 wire staples