1.Overall Length: 65mm/2.56" (Approx.)2.Designed For 1/4" Hex Shank Bits; fit for a variety of quick-change chucks; various flashlights; and screwdrivers.3.The bell-shape and magnetic hex insert allow the bit to hold the bit securely in place for quicker installations.4.Made of heat-treated chrome Vanadium steel; extra high hardness; good abrasion resistance; durable and long service life5.Applicable for installing in those hexagon tools; such as pneumatic screwdriver; electric screwdriver; pneumatic drill; electric drill; manual screwdriver; and more.