Arrow Fastener T50 3/8 in. W x 1/2 in. L 18 Ga. Flat Crown Heavy Duty Staples 5000 pk. Pack of 3, Packaging may vary. 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.