Valve cups (top collar) for Inlet and exhaust valve, for Norton twins, matchless twin 1964+ (each), titanium, set of 4. 4 required per engine. Suits Norton 500/600/650/750/850 Twins 1949-75 & Matchless 750 G15 1964-68 with Norton engine steel top valve spring collar (4 reqd). Thisckness: 0.35 inch (8.9mm); Diameter: 1.19 inch (30.25mm) Wt: 42g compared to 72g for set of steel collars. Original part numbers: D12/147; T2073; T186; NM186; 067506; 06-7506 - valve spring cup top
