12 piece ergo mixed screwdriver set contains 6 slotted, 4 Phillips, and 2 PoziDriv screwdrivers. The handles are a three component ergonomically designed that provides comfort and maximum grip even with oil hands. The handles are also color coded to indicate tip type and show tip type symbol on the bottom of the handle for quick identification. Chrome blades prevent corrosion and be easily cleaned. The tips are black oxide tips prevent chipping of chrome to reduce possible contamination at work location.