It is constructed with CR-V steel, and the shanks of these screwdrivers are heat-treated for exceptional hardness, increased torque, and a longer service life. The black and strong magnetic tips are not only anti-rust, but they also attract small screws, making it easier to handle tiny components with precision. The ergonomic handle design of the screwdrivers ensures a comfortable grip during prolonged use. INGCO Tools Kit 18 PCS Screwdriver and Precision Screwdriver Set (HKSD1828) is made from an environmentally friendly material and the two-color handle provides anti-slip and wear-resistant properties, making it ideal for heavy-duty tasks. The precision screwdrivers also feature separately rotating tail caps for easy maneuverability in tight spaces.