Comparison : Item # PTRY-1.00, Plain / Cylindrical Track Roller
Item # PTRY-1.00-R, Plain / Cylindrical Track Roller
Item # PTRY-1.00-SS, Plain / Cylindrical Track Roller
Item # PTRY-1.00-SS-R, Plain / Cylindrical Track Roller
Item # PTRY-1.00-SSP, Plain / Cylindrical Track Roller