Makita Impact Black bits are designed to withstand high torque when used with Impact Drivers. They are constructed from high strength, heat-treated S2 special steel. The black coating is to prevent rust. With precision-made tips to ensure a perfect hold. Up to 20% more durable than a standard bits. Socket Type: Nut Setter, AF Size - Metric: 13mm, Drive Size - Imperial: 1/4", Product Range: Makita - Impact Black Nut Setters, Country of Origin: China. Magnetic Length: 50mm, Pack quantity: 1.