The STIHL 42266407503 is a genuine OEM replacement gear designed for various STIHL blowers and shredder vacs. This essential component ensures proper power transmission within the machine's engine system. It is specifically compatible with models such as the BG 55, BG 65, BG 85, SH 55, SH 85, and BR 450 C-EF, providing reliable performance and maintaining original equipment specifications. This OEM part measures approximately 38.1 mm in length, 38.1 mm in width, and 12.7 mm in height, with a weight of 0.02268 kg.