Caterpillar-style premium aftermarket tooth retainer or locking component. Part reference 516-9166+. Size/application: Pin and Retainer 516-9166 and 516-9165. Matching tooth-system size: the matching tooth or wear system shown by the part reference. Combined pin-and-retainer set; both references are included in the product name. 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.