2 thumb idle throttle stop screw PWK Keihin carb 30mm 26mm 32mm Triumph BSA 4mm x 0.5
You will get the brand new set of 2 thumb idle screws with the spring and washer as pictured for your PWK carbs, all sizes.
Some of the PWK carbs use different thread pitch and diameter, this set is P29 4mm x 0.5, you should check before ordering, I have the other sizes listed.
This is Brand new made by Keihin
Manufacturer Part Number: SC-8577