Arrow Fastener T72 3/4 in. W x 7/8 in. L 15 Ga. Wide Crown Insulated Staples 300 pk. Pack of 4, Packaging may vary. The T72 Genuine Arrow insulated staples are made in the united states from quality steel material with a clear plastic insulator, suitable for a range of typical electrical cable installations. Available in 5 mm (13/64 inch) insulator height with 12 mm flat crown width and 9 mm (11/32 inch) insulator height with 15 mm grooved crown width and 22 mm staple leg length (19 mm for hard wood application variety).