Hi-Torque bits from Apex Fastener Tools formally Cooper Tools. Hi-Torque bits from Apex Fastener Tools, can be used for driving screws and fasteners with power tools, hand tools and pneumatic tools. The Hi-Torque® recess was designed to provide very high installation and removal torques, very shallow recess for use on 120° and 130° flush fasteners in thin skins, and to reduce the need for end-load of the driver. Apex Fastener Tools has developed special alloys that offer attributes suited to the specific demands of the aerospace and automotive repair sector. bits of equal hardness from different brands will yield different results.