*New!* Top Quality English Made Triumph Rear Wheel Bearing Locking Ring Securing Screw. This little Screw is almost impossible to find! We Guarantee that you will Not find this Screw in a Local “Hardware” Store anywhere in the World! Allen Screw Measures 1/4″ with the Correct 2BA Thread Pitch! Fits all Triumph 350 & 500 Unit Twins (Daytona, T100R, 3TA, 5TA, T100C, T90, Etc) from 1957-1974. Fits all Triumph 650 Unit Twins (Bonneville, T120R, Tiger, TR6, Etc) from 1963-1970. Fits Triumph & BSA Triples up to 1970. Also fits a wide range of Triumph Pre-Unit Twins up to 1962! Please refer to your parts catalog for proper fitment.*****Please note that this Allen Screw was fitted to most Triumph Twins with the “Spool” Rear Hub!*****Made in EnglandO.E.M Part number is 37-1710 or W1710