SD-556 Apex Phillips ® Head, 1/4” Drive, #2 Power Drive Bits With Finder Sleeves. Apex Phillips Bits from Apex Fastener Tools are designed to be used for driving screws and fasteners with hand tools, corded or cordless power tools, and pneumatic tools. The head on Apex Phillips Bits is designed to cam out when the screw stalls which prevents the fastener from damaging the work or the actual head. Apex Phillips Bits are manufactured to the tightest tolerances in the industry and all Bits from Apex Fastener Tools meet the most stringent government and military specifications.