Makita 125159-3 1/2" Arm AssemblyMakita 125159 3 Makita 1 2" Arm Assembly is designed as a replacement for the stock arm included on the Makita 3 8" x 21" Belt Sander model 9032. Allows use of standard 1 2" x 21" abrasive belts. The arm installs quickly and easily for added user convenience. Manufactured from high quality materials for added durability and long life. Key Features DESIGN : 1 2" replacement arm; use with standard 1 2" x 21" abrasive belts CONVENIENCE : Installs quickly