212-6-ACR Apex #6 ACR Torq-Set ® Bit, 1/4” Hex Drive Insert. Apex Torq-Set Screwdriver Bits from Apex Fastener Tools are designed with a cross of four arms that are offset from each other, so they do not align to form intersecting slots across the top of the head. Because of this, a regular Phillips or flat-head screwdriver will not fit the head. Apex Torq-Set is a cruciform screw drive used in torque-sensitive applications and is commonly used in aerospace applications. 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.