1/2" Electric Motor Arbor Adaptor. This is a new 1/2" electric motor arbor adaptor. This is used to convert 1/2" motor shafts to 1/2" threaded shafts for mounting polishing, buffing and grinding wheels. Measures approximately 3 9/16" (90 mm) long. We work hard to update our descriptions and pictures of our merchandise. As part of a process of ongoing innovation by our suppliers, newer versions of the item shown may be shipped before we are able to complete an update. As a result there may be a slight variation in color and design.