Ace Heavy Duty Staple 3/8 Narrow Crown 3/8" narrow crown For weather stripping,insulation, upholstery and carpet pads For Use In (Ace No. 2034775, 2014413) Arrow #T50, #HT50A, #T55, #ET50, Black & Decker #2000, #3000, #4000, #5700, Master Mechanic #M5000, #M5100, #M5500 Stanley Parker #PHT150, #69-500, #TR60, #69- 550 and Swingline #10401 Staple Guns