Altra Holdings likes to bring things to a stop. The company, through its principal subsidiary Altra Industrial Motion, manufactures mechanical power transmission and motion control products. Altra specializes in industrial clutches and brakes, gear drives, couplings, and bearings, used in such diverse assemblies as elevator braking systems and wheelchairs. Its lineup is marketed under multiple brands, including TB Wood's and Warner Electric, both directly and through distributors to OEMs in material handling, mining, and transportation industries. The company also caters to customers engaged in energy, food processing, medical, and turf and garden markets. North America accounts for more than 70% of sales.