1/4'' hex insert slotted screwdriver bits from Apex® Fastener Tools formally Cooper Tools. Slotted screwdriver bits have a single slot in the fastener head and the tool used to drive a slot is called a slot-head, flat-tip, or flat 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.