Sel-O-Fit screwdriver bits from Apex® Fastener Tools formally Cooper Tools. Sel-O-Fit bits are designed to provide a more efficient means of driving Pozidriv screws. The Sel-O-Fit bit places torque on the strongest and most mechanically advantageous portion of the driver tip. Apex® quality begins with select raw materials, only carefully chosen, high grade tool steel is used. Each Apex® bit is manufactured to the tightest tolerances in the industry, most are even tighter than licensing agreement requirements and all Apex® bits meet the most stringent government and military specifications.