Allows you to extend spindle length to adjust or align the position of the abrasive work surface. Adjusts spindle length for a variety of applications and conditions. Use with a backstand, bench grinder, benchtop or inline sander. Compatible with 5/8-11 threads. Extender Adapter allows mounting of 1 inch (2.54 cm) Scotch-Brite™ Radial Bristle Brushes - 8 inch (20.32 cm). Adapter designed to increase the utilization width of the standard 1 inch (2.54 cm) Scotch-Brite™ Radial Bristle Brush - 8 inch (20.32 cm). These products are used to optimally support 3M™ Coated Abrasives and 3M™ Surface Conditioning Products.