Specification: Size: Stop pushing pad: (Dia x H ) 8 x 2.5 cm / 3.15 x 0.98 inch (appr.) knight board: (Dia) 4 cm / 1.57 inch (appr.) Collar nut: (Dia) 2cm / 0.79 inch (appr.) Screwdriver Length :12.5cm / 4.92 inch (appr.) Package List: 1 x  Stop pushing pad 1 x Board 1 x Collar nut 1 x Screwdriver Features Applicable Model The gear assembly of the lawn mower is a nice replacement compatible with Stihl String Trimmer. Please confirm whether the product fits your lawn mower before purchasing. Premium Aluminum Material The gear of the grass trimmer is made of aluminum alloy with smooth and clear texture, has high hardness, colorfast and durable, and has a long service life. HIGH PERFORMANCE Exquisite workmanship and stable performance, it is the perfect accessory for mowers. This trimmer gear would be a great replacement for your old or broken one. Strict Quality Control The transmission kit is manufactured to standard Specifications in strict accordance with factory quality control. So you don't have to worry about product problems. Service Guarantee If you have any questions about the product or are unsatisfactory, you can contact our customer service at any time. Our team will reply you as soon as possible.