Monoprice 11-In-1 Hydraulic Precision Screwdriver Set with Ratchet (108142) This Screwdriver Uses A Hex Socket Head With Selectable Ratchet In Each Direction, Plus A Central Lock-Down Mode The Hex Head Uses Pressure Bearing Action To Keep The 1/8" Hex Driver Bit In Place The Driver Comes With 11 Bits The Driver Is Covered In No conducting Plastic With Rubber Grips The button on the side releases the dampened, spring-loaded bit chamber, which conveniently holds 10 of the 11 bits A plastic cap fits over the driver head, keeping the socket head and bit clean and dust free