Star 0325 7 teeth + bearing St ms170/180/210/230/250For chainsaw St ms170 ms180 ms210 ms230 ms250 017 018 021 023 025 Set: Clutch drum 0.325 "7-teethNeedle roller bearingDimensions:Diameter of the Cup outer-69mmInner cup diameter-66mmLanding diameter under the bearing-13mm