Extruder carbon steel construction Heat treated Black oxide finished for durability Long arm SAE: 1/16, 5/64, 3/32, 7/64, 1/8, 5/32, 3/16, 7/32, 1/4, 5/16 and 3/8" Short arm metric: 0.05, 1.27, 1.5, 2, 2.5, 3, 4, 4.5, 5, 5.5, 6, 7, 8 and 10mm