MAS90291 is part of the Master Clutch Service Tool Set MAS91274 which contains all the tools needed to service clutches on the following compressors: General Motors A6, R4, and DA6; 6 Pole R4, V5 and HR-6; Ford FS6; Chrysler C171; Nippondenso 6P 148A; Sanden 507, 508 and 510 and Pitts and Warner clutches.