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 standard bit holder. Length: 60mm. For Use With: 1/4" Hex Bits. Product Range: Makita - Magnetic Bit Holders. Country of Origin: China. Excellent magnetic bit holder, works well with 25mm and 50mm Impact Black screw bits. Magnetic 60 mm bit holder for 1/4" hex bits.