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Inside Diameter
Center Hole Pattern
Blade Adapter Pulley Diameter
![Blade Adapter w/ Pulley - 3.8" x 25 mm Inside Dia.](https://www.mtdparts.com/dw/image/v2/BCSH_PRD/on/demandware.static/-/Sites-mtd-master-catalog/default/dw18f424cd/products/987-02221.jpg?sw=258&sh=258&sm=fit "Blade Adapter w/ Pulley - 3.8" x 25 mm Inside Dia.")