The Rotur Set of 5 Brass Nuts are a useful accessory for any pen turning enthusiast. Made in the UK, these nuts are crafted from high-quality brass and feature a 1/4" BSF thread for use with the Pen mandrel shaft and other accessories. They provide secure and precise clamping of the pen blank, ensuring stability and accuracy during the turning process. This set of 5 nuts is a cost-effective way to replenish your supply or to have extras on hand for future projects. 5 Brass Nuts: PM5BN