Ideal for fast polishing and light deburring of internal holes or grooves as small as 1/2 in|Flexible cotton backing for superior conformability and life|Wheels are designed with the steel shank as an integral part of each wheel for better balance and quick changes on air tools that have a collet design|Includes five wheels, 3/8" to 1-3/16" diameter in various grits, mounted on a 1/8" diameter hardened steel shank|