Note:Installation guide not included, we strongly recommend you professional installation. Please check as much as possible to make sure the item is what you need. Clutch Drum Chain Sprocket Fit For Chainsaw Part number: 503873072 578097901 503873073 503873071 503255201 108565X GB HU414A7N Warning! Please confirm your size before purchase! Fit For Chainsaw Fit For 340 Chainsaw Fit For 340E Chainsaw Fit For 345 Chainsaw Fit For 345E Chainsaw Fit For 350 Chainsaw Fit For 351 Chainsaw Fit For 353 Chainsaw Fit For 445 Chainsaw Fit For 445 II Chainsaw Fit For 445E Chainsaw Fit For 445E II Chainsaw Fit For 450 Chainsaw Fit For 450E Chainsaw Fit For 450E II Chainsaw Tips:The product may be updated constantly,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use. Colour:As Shown Material:Metal Package Contents: 1 * Clutch 1 * Clutch Drum Chain Sprocket 1 * Needle Bearing Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.