Clutch Cover Bumper Spike Screw Bar Stud Nut Kit For Stihl MS180 MS170 018 017 MS 180 170 Chainsaw Replacement Parts For Stihl MS180 MS170 018 017 chainsaw parts Replace OEM for 1123 640 1705, 1123 664 0501, 0000 953 6605, 0000 955 0801 Package include 2 x Bumper Spike, 2 x Bar Nuts, 2 x Bar Studs, 2 x Bumper Spike Screw, 1 x Clutch Cover