Made of heat-treated CR-V steel for enhanced sturdiness, rust resistant and anti-corrosion. | Attracts screws easily and tightly. Blackening treatment effectively prevents rust and reduce cam-out. | Non-slip and soft handle provides you a comfortable hold as well as maximum control at work. Handle slot accepts other screwdrivers for added leverage. | Designed for a wide variety of projects and repairs in domestic appliances, furniture, automotive, factory. | 12 professional grade screwdrivers --- Slotted: 3/16X5",1/4X4",5/32X4",1/8X3",3/32X2",1/4X1-1/2"; Phillips: PH1X5",PH2X4",PH1X4",PH0X3",PH00X2",PH2X1-1/2"