AuzGrip A84866 250mm 1 2" Square Drive Impact Extension Bar Castors~Wheels The Grip Poly Moulded Cast A84115 The Grip Poly Moulded Cast Iron Fixed Castor is a durable and high performance mobility solution designed for demanding industrial environments The Grip 42092 100mm Poly Moulded Poly Core Swivel Castor is designed for medium to heavy duty mobility applications where smooth movement and load support are required Spring ball socket retainer and drilled head to accept retaining pin and "O" ring Heavy duty industrial quality extension manufactured from drop forged Chrome Molybdenum steel with Manganese Phosphate finish for greater corrosion resistance