Park Pin for CT-2, CT-3, CT-5 & CT-7 Made from hardened alloy tool steel Uses 7mm or 9/32" 12 pt box end/socket Sold singly or in pairs Park Tool's Replacement Chain Tool Pin (2-Pack) fits Park Tool's CT-1, CT-2, CT-3, CT-3.2, CT-5, and CT-7 Chain Tools.