For use with 1/4″ and 3/8″ drive ratchets and accessories when a standard tap wrench will not reach. Set consists of four 1/4″ drive and four 3/8″ drive special square sockets for driving standard taps from 1.5mm to 12mm and 1/16″-1/2″UNC/F. Item No. Fits Inch Sizes Fits Metric Sizes Shank DIA. Square Size T0801 No. 1,2,3,4,5,6 M1.6, 1.8, 2.0, 2.2, 2.5 0.141 0.11 T0802 No. 8 M3.0, 3.15, 3.5 0.168 0.131 T0803 No. 10 M4.0 0.194 0.152 T0804 1/4″ M4.5, 5.0 0.255 0.191 T0805 5/16″, 7/16″ M6.0, M6.3 0.323 0.242 T0806 3/8″ M7.0, 8.0 0.381 0.286 T0807 1/2″ M10.0 0.367 0.275 T0808 1/8NPT M12.0, 12.5 0.437 0.328
