Apex 5/16'' Phillips Head Square Drive Insert Bits

5/16'' Phillips head screwdriver bits from Apex® Fastener Tools formally Cooper Tools. The Phillips head bit is purposely designed to cam out when the screw stalls, preventing the fastener from damaging the work or the head. 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.