Designed to break roller chain 520 up to 630 (Fits all standard & O-ring chain sizes 520 to 630) Designed to rivet chain up to 530 (not 630) Master link side plate press kit included to press on side plates on chains up to 530 (not 630) Screws & attachments are heat treated for strength and durability The extractor pin is precisely guided by a removable guide, ensuring long pin life May be bolted to a work bench, supported in a vise or held by handle When bolted to a solid surface, air or electric wrenches may be used to break chain Recommended for heavy-duty use For riveting hollow nose master links Requires 08-0142 Quad Stake Rivet Kit (not included) to rivet soft-nose type master link pin tip