Doherty chromed twist-grip/throttle for 7/8 inch (22mm) handlebars. The head of the throttle is chromed and has the Doherty logo stamped into it. The chrome is good but not perfect. The sleeve is white nylon/plastic. It has a lovely smooth action. The twist-grip is for a single cable. This is a second hand twistgrip. The head of the throttle measures 2.25 inches 55 mm)diameter and is 1 inch (25mm) deep.