Ideal primarily for making collars, harnesses for larger dogs, and outdoor gear such as backpack buckles and belts. Compatible with Biothane straps of 25 mm and 38 mm widths. Material: Zinc alloy with nickel-plated finish. Breaking load: 17 mm - 120 kg; 20 mm - 180 kg; 25 mm - 230 kg; 38 mm PLUS version - 250 kg.