Includes (2) 791-181815 NutsNew, Bulk PackedGenuine OEM Replacement Part # 791-181815-2PKConsult owners manual for proper part number identification and proper installationPlease refer to list for compatibilityCompatible with the following: Ryobi: 410r, 410r, 410r, 410r, 410r, 410r, 410r, 510r, 510r, 720r, 720r, 725r, 725r, 725r, 725r, 725r, 725r, 725r, 725r, 725r, 725r, 725r, 725r, 725r, 725r, 725r, 725r, 725rE, 725rE, 725rE, 725rE, 725rE, 725rE, 750r, 750r, 750r, 750r, 750r, 767rJ, 767rJ, 770rEB, 775r, 775r, 775r, 775r, 775r, 775r, 775r, 775r, 775r, 775r, 775r, 775r, 775r, 775r, 780r, 780r, 780r, 790r, 790r, 790r, 790r, 790r, 825r, 825r, 875r, 875r, 875r, 875r, 890, 890r, 890r, 890r, 890r, 890r, 740R, 825RA, 825r, 1090R, 990R, 2090R, 975R, 2090RC MTD: MP426CS, 41AD26SC900, 41BD26SC900, 41CD26SC900, 41AD725C900, 41AD725G900, 21A-120R000, MT780 Troy-Bilt: TBBC, TBBC, TB25ET, TB25ET, TB4000, TB25ET, TB25ET, TB25ET, TB490BC, TB490BC, TB490BC, TB490BC, TB90BC, TB90BC, TB90BC, TB90BC, TB90BC, TB90BC, TB490BC, TB525ET, TB590BC, TB590BC, TB425CS, TB425CS, TB425CS, TB425CS, TB590EC, TB590EC, TB590EC, TB590EC Bolens: BL41021BK410G163, BL41021B-121R765, BL41021AK410G163, BL41021A-121R965, BL25041AD250G163, BL25041AD25G-065, BL25041BD250G163, BL25041CD250G163, BL26BC41AD26BC965, BL26CO41AD02OG965, BL26CO41AD26OG965, BL26SS41AD26SC965 YardMan: 121R, 122R, YM21SS, YM26CO, YM26SS, YM26SS, YM26BC, YM26BC, YM26BC, YM26CO, YM26CO, YM26CS, YM26CS, YM26CS, YM90, YM90, YM90BC