More Felt Bobs and Shank Mounted Wheels : Our felt bobs are made from the finest wool and materials. They are designed to be used with all our compounds to cut and polish and get in all the small places where wheels can' t get. Producing a high surface finish on all dies and molds, which gives them a longer service life. Ideal to use with reciprocators or rotary tools. Has a multitude of shapes for those difficult places to buff and polish. With � 2.34mm, � 3.0mm, � 6.0mm shanks.