The BlueSpot 3 Pce Hose Clamp Pliers are manufactured from heat resistant nylon.The clamps feature a locking mechanism for simple, one-handed use and the rounded jaw edges prevent damage to internal hose reinforcement. The range of sizes ensures you have the appropriate tool for securing; brake and fuel hoses (small), heater hoses (medium) and radiator hoses (large).Set includes sizes; 150mm, 180mm and 250mm.