[Compatible Models]: Cylinder with Piston for Homelite CSP4602 CSP 4016 CSP 4040 CSP 4520 CSP 4550 CSP 4518. [Replace Part Number]:640840001 [Package Include]:1 Cylinder , 1 x Piston, 1 x Pin, 2 Rings, 2 x Circlips, 1 x Spark Plug.[100% Satisfaction Guarantee]: High Quality Lifetime Replacement Parts Accessories and long lasting, 90 days return, refund or free exchange if you are not completely satisfied (defection, accidental damage, non-satisfaction, etc.) Please feel free to contact us.[Note ]: Please compare it with your original parts before ordering to see if it can for your original chainsaw. [Compatible Models]: Cylinder with Piston for Homelite CSP4602 CSP 4016 CSP 4040 CSP 4520 CSP 4550 CSP 4518. [Replace Part Number]:640840001 [Package Include]:1 Cylinder, 1 x Piston, 1 x Pin, 2 Rings, 2 x circlips, 1 x spark plug