This US PRO 7pc Insulated Electricians Screwdriver Set is manufactured from chrome vanadium 6150 and features heat-treated tips. The screwdrivers are fully insulated and rated at 1000V, offering protection for electrical work. They come with a quality comfortable grip for ease of use and are supplied in a storage tray. The set includes slotted screwdrivers of sizes 3 x 75mm, 4 x 100mm, 5.5 x 125mm, and 6.5 x 150mm, as well as Pozi screwdrivers PZ0 x 75mm, PZ1 x 80mm, and PZ2 x 100mm.