Chainsaw Replacement Bumper Spikes Felling Dog Bolt Screw Set compatible with Compatible With Stihl MS170 MS171 MS180 MS181 MS190T MS192T MS193T MS200 MS200T MS201 MS210 MS230 MS250 017, 017C, 018C, 018, 019T, 020T, 021, 023L, 023, 025 chain saws repair kit Replaces OEM number: 1123 664 0500, 1123 664 0501, 1129 664 0500. Package include: 2 bumper spikes, 4 screws as shown in picture. Replacement Bumper Spikes Felling Dog Bolt Screw Set designed for compatibility with Stihl MS170, MS171, MS180, MS181, MS190T, MS192T, MS193T, MS200, MS200T, MS201, MS210, MS230, MS250, 017, 017C, 018C, 018, 019T, 020T, 021, 023L, 023, 025 chain saws repair kit. This set replaces OEM numbers 1123 664 0500, 1123 664 0501, 1129 664 0500. The package includes 2 bumper spikes and 4 screws. Please refer to the pictures for the details.