two screws with washers and a gasket

They can be mounted in a variety of ways

These are the base gaskets we use on our Triumph race bikes

chrome plated

This includes BSA B25

Single Cable Throttle - 7/8 inch - With Jackhammer Grips Ebay_No two screws with washers andThis is an inexpensive, all metal, single pull throttle for 7 8" handlebars. It features a metal throttle tube, chrome housing, and a throttle stop screw. Works well with most cables found on vintage British bikes and may be used for other applications with a custom made throttle cable with the correct end for the throttle tube. This throttle also includes black jackhammer style grips as well.