This item is manufactured with gentle and durable material for practical and use. Depth stop design can screw penetration and damage for board, more useful and convenient. Accurately locks screws while reducing abrasion to the screw and the screwdriver head for . Features -Color: Silver. -Material: Chromium vanadium alloy steel. -Size: About 5.00X1.50X1.50cm/1.97X0.59X0.59inch. -The positioning screw bits can easily and quickly catch the screw and fix it to prevent the drill bit from slipping. -You will receive enough pieces of screw bits, with different types for your needs. -Suitable for carpentry, auto repair, assembling furniture, jobs around the house etc. -Made of durable and gentle material, not easy to break and wear, with good hardness. -Corrosion resistance and rust resistance, easy to install and use, bring much convenience. Package list: 5 x screw positioning bits (50mm, 25mm)