TRW11-2PK 2PC 5/8” Hex Power Drive Bit Pack for #11 Tri-Wing® Recess. Screwdriver Bit, Tri-Wing®, 5/8” Hex Drive Power Drive Shank, Recess Size #11, 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.