It tightens loose screws . Equipped with 10 types of screwdriver bits in one screwdriver set. An essential tool for home or office using, which would countless hours. Anti- and L-shaped handle grip, very practical for horizontal and vertical usage. It is made of high hardness 45 steel with and strong flexibility. Name: Double-headed 1/4 inch hexagon socket wrench Colour: black+yellow+silver Material: 45 steel Size: 105x31mm Package Contents: 1 * L-shaped wrench 10 * Screwdriver bits with yellow base (S4, S5, S6, PH0, PH1, PH2, PH3, T15, T20, T25) Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.