Designed to break roller chain up to #630 (Fits all standard and 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 up to #530 (#630)Screws and attachments are made from 86L20 steel and then heat treated for strength and durabilityExtractor pin is firmly guided by removable guide, ensuring long pin lifeMay be bolted to work bench, supported in vise or held by handleBolted to solid surface, air or electric wrenches may be used to break chainRecommended for heavy-duty useMade in the U.S.A.Great for use with the 57-8142 Quad stake rivet kit