Use this steel pin mandrel to hold 3mm polishing pins. The textured finish on the jaw and collar ensure a secure grip when securing the pin in the mandrel. Polishing pins, designed for finishing and polishing, are a great choice for accessing hard-to-reach areas and fine details. The mandrel features 3/32" shank, ideal for use in your flex shaft or other rotary equipment. Use the polishing pin at lower speeds to have greater flexibility with a softer touch, producing subtle results; use at higher speeds for more aggressive results.