Caterpillar-style premium aftermarket tooth retainer or locking component. Part reference 136-8308. Size/application: Ripper Pin Retainer R300. Matching tooth-system size: ripper/scarifier system (J-size not applicable). Matching pin reference depends on the installed system generation and is not separately identified in this catalog. Secures the replaceable tooth, protector or ripper component to its matching adapter. Brand compatibility: Caterpillar and premium aftermarket systems built to the matching Caterpillar specification. This hardware fits only the specified system and matching dimensions.