This 20 piece wire brush cleaning kit has a wide range of applications, including removing carbon from internal threads or pipes and cleaning drilled holes. Made from tough steel, brass and nylon, each brush has a 6mm (1/4") hex drive shank. The kit includes a quick release screwdriver with a comfortable handle and a 150mm (6") extension with a quick release chuck. Amtech offers a fantastic range of essential tools for all your DIY requirements with great value prices and a compelling 3 year product guarantee.