Includes (2) 86460 O-RingsNew, Bulk PackedGenuine OEM Replacement Part # 86460-2PKConsult owners manual for proper part number identification and proper installationPlease refer to list for compatibilityCompatible with the following: Bostitch 538S214, 538S4, 538S5, MIIIFS, MIIIFN, MIII812CNCT Tool, MCN250S Metal Connector, N75C Sheathing, N66C, N66BC Cap, MCN250 Metal Connector, N66BC-1Cap, N75C-1 Coil Sheathing/Siding, N66C-115 Degrees Coil Siding,