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.Light weight, non conductive plasticIdeal for clamping flexible hosesSingle handed use150mm, 180mm and 250mmMaximum jaw opening: 150mm - 15mm / 180mm - 30mm / 250mm - 60mm