The bit extension holder and bit are made with a material with heavy duty construction to ensure maximum efficiency. The chrome finish of drill bit holder give an added resistance to rust. The bit holder can be used for a variety of drivers making it very handy and flexible.Features:Hard steel holder extension bar and S2 steel bit for maximum durability, the heavy-duty construction allows for long service life. Bit holder has strong magnetism for quick connect or disconnect and ensuring stay in place while driving. Universal 1/4inch quick hex shank and 1/4inch hex socket fit most electric drivers, hand-held drivers and bits. The small size allows you to bring your bit extension bar anywhere to get any job done and can fit into many tool bag. Very helpful to remove or tighten a large number of screws after you've started or loosened them. This bit holder extension bar is equipped with a PH2 bit, you need not to buy a new bit. Specifications:Bit Holder:Material: Chrome-vanadium steel(black), stainless steel(silver), aluminum(red)Hex Socket Size: 6.35mm(1/4")Head diameter: 7.5mm(0.29")Length: 60mm(2.36")Bit:Model: PH2Material: S2 steelLength: 25mm(0.98") Bit holder and bit weight: 25gPackage Includes:1 x Bit Holder Extension Bar1 x PH2 Bit