Compatible with Stihl mower gearbox head. The outer diameter of the reducing ring is 25.4mm, the inner diameter is 20mm, and the thickness is 2mm. Please check carefully. Made of 304 stainless steel, it has excellent rust and corrosion resistance and is suitable for complex outdoor working environments such as high humidity and high dust. Effectively fill the shaft diameter gap to prevent the mowing head from loosening or swinging, and improve the stability and safety of mowing operations. Provide 10 reducing rings at a time, suitable for installation on multiple equipment or as a spare for maintenance, with high cost performance., Manufacturer: ECSiNG