These sand paper holders
are easy to use. Just put your abrasive paper around the stick and set. Useful for filling inside rings, narrow areas etc. Square and round surfaces are available.
The sand paper holders are handy when filing inside rings in narrow areas. The holders come in two types, square and round. To use, place the abrasive paper around the stick and set. See the square and round paper holders and other items at Stuller.com/tools.