These chucks have been specifically designed to meet requirements for a low clamping force with high precision. For internal and external holding of cylindrical workpieces. The jaws are moved in and out by simply rotating the clamping ring by hand or using the supplied lever. The hardened internal jaws, supplied as standard are reversible. The jaw number is marked on the top and bottom face of each jaw.The jaw number is marked on the matching slot of the chuck body.