Heat Treatment Technology: Heavy-duty impact wrench bits, heat-treated bits for improved durability and a torsion zone for less breakage, forged tip for increased impact resistance and longer life. Fits Most Drill Bits: Universal 1/4 quick-change hex shanks fit all threads. Suitable for AEG, ARO, Atlas-Copco, Biax, Black Decker, Bosch, Buckeye Tools, etc. Super Magnetic: The bit holder is highly magnetic to hold the bit. The shaft has a hexagonal shape to prevent it from slipping through the chuck. Drill Extension Rod: For socket and joint exchange, connecting rod extension. Universal heavy-duty magnetic bit holder for 1/4-inch bits. High-Quality Material: Made of high-quality metal raw materials, including No. 45, CRV, S2, etc. Durable, sturdy, high corrosion resistance, long service life. Specification: Length: 60 mm Hex Size: 1/4 " Material: Stainless Steel Silver Package Quantity: 10 pieces