Features: Those U-shaped Tip Screwdriver Bit is selected for alloy steel which is a commonly used material with high hardness in hardware. 5 sizes of U-shaped head a set at an affordable prices can meet your requirements. Greatly improve the accuracy, save-time and convenient for operation. Great workmanship, with strict quality control and quality assurance, high safety factors, can be used with peace of mind. It is light in weight, small in size, convenient for you to store and manage, will not take up too much space Specifications: Material:Chromium-vanadium alloy steel Package Includes: 5Pcs Special-shaped Screwdriver note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.