Arrow Fastener T50 3/8 in. W x 5/16 in. L 18 Ga. Flat Crown Heavy Duty Staples 5000 pk Pack of 3, Packaging may vary. STAPLES T50 5/16"PK5000 The T50 Genuine Arrow staples are made in the united states from quality steel material, ensuring your stapling is precise, strong and long-lasting – first time, every time. Available in 6mm (1/4 inch), 8mm (5/16 inch), 10mm (3/8 inch), 12mm (1/2 inch), 13mm (17/32 inch) and 14mm (9/16 inch) sizes with a flat crown width of 10mm. Also in stainless steel and monel materials.