Top Quality Triumph 650 Unit Twins Rocker Box Securing Spring Clip Screw Set. Here at C.B.S. we have seen may Engines that where either Missing these Screws or had the incorrect Screws installed! Only use Correct Parts on your Triumph! Screws Measure 1/4″ X 3/8″ with a Thread Pitch of 26 TPI (CEI)! Notice the Correct Pozi Drive Head? Fits all Triumph 650 Unit Twins (Bonneville, Tiger, Trophy, T120, TR6, T120TT, TR6C, Etc) from 1963-1970. Please refer to your parts catalog for proper fitment.*****Please note that this Screw set may fit other Triumph 650 Unit Twins from 1963-1970 that are not listed abouve!*****Made in EnglandO.E.M Part number is 57-1553 or T1553