This 5-piece Slotted and Phillips Ergonomic screwdriver set features a first of it's kind memory-cushion handle that adapts to the user's hand. The handle's built-in anti-roll design prevents the tool from slipping out of your hands and taking off on its own when torquing down a screw. The handle is also seamless and smooth for maximum comfort. The blade type is printed on the top and on grip of the handle for fast identification of the tip type. Blades are manufactured from chrome-molybdenum-vanadium steel and designed for a precise fit.