This 400m Button Jaw set is suitable to grip large diameter bowls. So called because they use eight conical white rubber buttons to grip the work and pull it securely back against the aluminium jaw plates without damaging the edge. Although the rubber buttons are easy on the wood they are not really suitable for bowls with a very fine edge, these are better held in specially made wooden jaws mounted on the Axminster wood jaw plates. As an alternative to using the buttons, stacking turn studs are available as an optional extra. These are designed as a primary holding device for all manner of round or square blanks and giving a very secure holding method, they can be used singularly or doubled up using the longer bolts supplied. Jaws are supplied complete with buttons, with spare buttons available individually. For better access, a longer chuck key may be required when using button jaws. Not suitable for mounting onto the SK80 Clubman chuck. Recommended maximum speed 1,000rpm.