Features: 4pcs hex screw driver tools set, 1.5/2/2.5/3.0mm are available. Tungsten Steel material, high hardness, very durable in use, corrosion resistance and anti-rust. Simple and practical design, exqusite workmanship, anti-slip and comfortable hand grip and easy to use. Widely used for repairing or assembling remote control RC for cars, helicoptor, boat, quadcopter, planes and other devices. It can also be used in production lines such as electric screwdrivers, screwdrivers, electric drills, air drills, etc., engineering, machinery, and home appliance repairs. Specifications: Main Material: Tungsten Steel Length: Approx. 21.5 for cm/8.46 inch Package Includes: 1x 1.5mm Hex for Key Socket Screwdriver 1x 2.0mm Hex for Key Socket Screwdriver 1x 2.5mm Hex for Key Socket Screwdriver 1x 3.0mm Hex for Key Socket Screwdriver note: Please allow 1-2cm errors due to manual measurement,pls make sure that you do not mind before you mind. Due to the difference between different monitors, the picture may not reflect the actual color of the item.