John Deere-style premium aftermarket tooth or wear-system pin. Part reference TK400PI. Size/application: Pin TK400. Matching tooth-system size: John Deere TK400. Matching retainer reference: TK4LI. Secures the replaceable tooth, protector or ripper component to its matching adapter. Brand compatibility: John Deere and premium aftermarket systems built to the matching John Deere specification. This hardware fits only the specified system and matching dimensions.