The felt polishing point is made to take a semi-rough finish and polish it to a smooth finish. Ideal for general polishing of most ferrous metals, stones, glass and ceramics. Can be used with 421 polishing compound. Perfect for general polishing of most ferrous metals, stones, glass and ceramics. Felt polishing bobs can be used with or without polishing compound. Self-renewing surface ensures that the felt polishing cone maintains its effectiveness. Ideal for polishing in corners and hard-to-get-at places. Fits mandrel Model No. 401.