ITEM NAME:4X Exhaust Muffler Bolts Screw fit for Stihl 021 023 025 MS210 MS230 MS250 Hf 4x Muffler Bolts Replacement fit for Stihl 021 023 025 MS210 MS230 MS250 Chainsaw SPECIFICATIONS.(Compatible With: fit for Stihl 021 023 025 MS210 MS230 MS250 Chainsaw. Item included: 4 x Muffler Bolt. 2) Perfect match for the original one.