【Compatible With】 for Stihl FS 38, FS 40, FS 45, FS 55, FS 56, FS 70, HL 45, HT 56 and more series of brush cutters. 【Improve Handling】 The high-quality sprocket helps improve the handling of the brush cutter's pivoting head, giving you better control and increasing gardening efficiency. 【Package Includes】 Clutch × 1, Clutch Drum × 1. 【Perfect Fit】 Designed and manufactured according to the Strict OEM standards, the clutch drum fits perfectly with the original parts. Replacement work will be quick and easy. 【Part Number】 Clutch - 4140 160 2005 and 4140 160 2001. Clutch Drum - 4144 160 2904.