they are 1 inch diameter with a 3/8 inch shaft for the spring to sit over

They have a ribbed rubber flange that measures about 1-7/8" across

with special emphasis on automotive and motorcycle components and accessories

Fits Triumph TR25W

Note: It is advisable to check the inside diameter of the pipes you want to use these tips on to be sure they are going to fit

Whitworth 6 pc 12-pt Socket set Koken 3/8 inch drive Subcategory_Tank Fabrication Parts they are 1 inch diameterA high quality set of Whitworth 12 point sockets by Koken (Japan). 3 8" drive. Includes a socket holder. A set of Whitworth tools for your old british motorcycle (Triumph, BSA, Norton, etc) or car is necessary, due to BSW or British Standard Whitworth hardware. Your standard or metric tools will never fit right and will round out your bolt heads. This set of 6 12 point sockets includes 1 8 WW, 3 16" WW, 1 4" WW, 5 16" WW, 3 8" WW, and 7 16" WW sockets.