This pair of Triumph exhaust clamps fit Triumph motorcycles with 1-3/4 inch exhaust spigots such as all 650 c.c. pre-unit and unit construction bikes from 1950-1971. These finned exhaust pipe clamps are stainless steel, and include the pinch bolt and washer, ready to install. This is the earlier style with 23 fins, later Triumph exhaust clamps look and fit exactly the same though they only have 17 fins. Sold per pair. Replacement for Triumph OEM # 70-4501