Brake drum and sprocket, suit Norton rigid and brazed frame swing arm models. 43 teeth, 5/8 x 1/4 inch. Suit models 1, 16H, 18 and swing arm ES2 and 19, Model 7. Branded Made in EnglandOriginal part number:9518, A2/463, 50073; E2/463; 50087; D12/463; 19004B - Rear brake drum and sprocket