This is a A-PLW5 Pulley PN: PLW5Main Description As Following : A-PLW5 Pulley P.N: PLW5 This pulley can be used with either A or B width belts due to its dual groove / taper configuration.Hub Required: WOutside Diameter: 5" Crossed From: WSP500W , , 21020050 , , 21020050 , , 2827-44227 JOHN DAY , 673-S85010600 , , 673S85010600 , Found in Section & Models : Chains/ Sprockets/ Pulleys/ Hubs > Pulleys, (Miscellaneous) (UNDEFINED): SEVERAL Associated Items : New Also This is An Aftermarket Product And : This pulley can be used with either A or B width belts due to its dual groove / taper configuration. Hub Required: W Outside Diameter: 5"