Caterpillar-style premium aftermarket tooth retainer or locking component. Part reference 8E4743. Size/application: Retainer R450 Ripper. Matching tooth-system size: ripper/scarifier system (J-size not applicable). Matching pin reference: 6Y3394. 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.