This chromemoly steel chain breaker made by Motion Pro works on any 420 - 620 series chain

or if you need to remove your clutch basket while rebuilding your gear box or entire motor

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

The are comparable protective coatings and will not affect the function of the tool

Valve Adjusting Tool - Triumph / British motorcycles Vendor_A&I Metal Finishing This chromemoly steel chain breakerThis specialty 4 piece valve adjusting tool makes adjust your valve clearance on your Triumph, BSA or Norton motorcycle a breeze. No more trying to fit a wrench into your rocker box while turning the square adjuster with a crescent wrench. This tool is a perfect fit for the lock nut and the knurled knob makes it easy to adjust your clearance, then hold it steady while you tighten the locknut down in one easy motion. With the different tools included