This clutch drum sprocket rim needle cage assembly is designed for use with chainsaw models 038, 038AV, MS380, MS381, and MS381N.It features a 7-tooth sprocket with a 3/8-inch spur pitch to maintain consistent chain engagement and tension.The drum has an inner diameter of 72 mm, an overall height of 41 mm, and a center bore of 16 mm to align with compatible drive systems.The assembly includes the clutch drum, sprocket rim, and needle cage, offering a complete replacement solution.Engineered for direct fitment, it simplifies servicing by eliminating the need to source individual components, helping reduce downtime during maintenance.Suitable for routine repairs or performance restoration in specified chainsaw models.