The snap hook features a spring loaded gate which allows it to be quickly and securely attached to your multi gym and gym attachments. Each hook is steel construction with zinc-plated finish for durability in the toughest of workouts. The dimensions and Maximum Working Loads for each hook are given below: M5 Length x Width x Thickness: 50mm x 25mm x 5mm. Diameter: 5mm. MWL 45KG M6 Length x Width x Thickness: 60mm x 30mm x 6mm. Diameter: 6mm. MWL 60KG M8 Length x Width x Thickness: 80mm x 40mm x 8mm. Diameter: 8mm. MWL 115KG M10 Length x Width x Thickness: 100mm x 50mm x 10mm. Diameter: 10mm. MWL 170KG