Quick action twistgrip with nice smooth action. The twistgrip has a black gloss finish with nylon sleeve. This twistgrip/throttle fits 7/8 inch 22mm diameter handlebars. The cable entry is threaded for an adjuster (not included). The diameter of the head is approx. 60mm (2 1/4 inches) . The throttle is made of a dense plastic material and fastens together with stainless steel allen bolts.