TRW12-2PK 2PC Hex Power Drive Bit Pack for 5/8” Tri-Wing® #12 Recess. Screwdriver Bit, Tri-Wing®, 5/8” Hex Drive Power Drive Shank, Recess Size #12, overall length 1-1/4”. The Tri-Wing® bit, also known as Triangular Slotted, screw drive has three radial slots. Tri-Wing®, as the name suggests, is a screw with three ”wings” and a small triangular hole in the center. Tri-Wing® fasteners are becoming extremely common in automotive repair and appliance assembly.