SpecificationsLength: 60mm/100mm/150mm ( 2.36"/3.94"/5.9" ); Shank Size: 6.35mm (1/4"); Shank shape: hexagonal shank High QualityThe magnetic screwdriver extension bar, made of chrome vanadium steel, wear-resistant and impact-resistant, has a long service life Strong magnetismMagnetic extension rod, interface with locking mechanism, strong magnet inside, fast fixing, can effectively improve work efficiency Compatibility Universal 1/4" hex shank of the magnetic bit holder fits most drills and power screwdrivers, allowing quick release and replacement Good PracticalityThe screwdriver holder 1/4 magnetic, suitable for pneumatic and electric screwdrivers, air drills and hand screwdrivers; Perfect for professionals as well as DIY enthusiasts Product Description set of 3 hexagonal magnetic screwdriver bit holders length 60mm / 100mm / 150mm Made of stainless steel chrome vanadium (CR-V), heat treated, high hardness, wear resistance, durable and long service life. Quick release locking sleeve, allows you to install, lock and quickly unlock the drill bit. 3 different lengths fit your tools perfectly, built-in magnet (only the bottom of the hole part), fast and fast clamping greatly improve work efficiency. This bit holder set is a good tool accessory for conversion, suitable for universal 1/4" hex drills and screwdrivers. The magnetic bit holder for screwdriver has a locking mechanism in the interfaces, with a built-in powerful magnet and an automatic pop-up header for quick fastening essential in home and professional use. ------- Features------- Material: Chrome Vanadium Steel Hex Shank Diameter: 1/4 inch (6.35mm) < p >Length: 60mm/100mm/150mm ( 2.36inch / 3.94inch / 5.9inch ) -------Please note------- - You have to pull the knurled end against a spring to release the bit. - Does not fit double head screwdriver bits, only fits hex bits. - Alone the bottom of the hole part is magnetic, there is no magnetism on the surface of the bit holder. The role of magnets is only to tighten the bundles better. - Please allow 1-3mm error due to manual measurement. ------- Package Included------- 1 x 60mm screwdriver bit holder 1 x 100mm screwdriver bit holder 1 x screwdriver bit holder of 150mm screwdriver