440-4-ACR4X Apex Phillips ® ACR Power Drive Bit can be used for driving screws and fasteners with hand tools, corded or cordless power tools, and pneumatic tools. P440-4-ACR4X Apex Phillips ® ACR Power Drive Bit are popular throughout the aviation industry as well as automotive, heavy industry or anywhere quality tooling products are required. Apex Phillips ® bits are known worldwide for their quality construction and durability in demanding conditions. Made with the most durable construction these bits are known for prolonged use and tool life.