Snap On mandrels run the gamut on quality. Cheaper ones have prongs that compress quickly and allow the disk to spin on the mandrel when applied to the work. Better ones resist compression. These mandrels are cheap enough as they are, so spend a little more, get a better one and save the headache! Sold individually.
Note:This Device falls under Bur, Surgical, General & Plastic Surgery. The FDA deems this item a class I device. The FDA's Office of Device Evaluation has given class I devices a 50(K) exemption, Regulation number 878.4820.