The BlueSpot 1/2" Power Bar Replacement Head is manufactured from heat treated and tempered steel with a blackened phosphate coating to protect against corrosion. Contains replacement head and fixing screw. *This item is not covered under the terms of our lifetime guarantee Package Contents - 1/2" power bar head with fixing screwManufactured from heat treated and tempered steel for increased durabilityBlackened phosphate coating protects against corrosionHead opening 13.78mmScrew size 7.77mm