This is a stepped dovetail jaw set for the Easy Chuck.
Made of nickel-plated, hardened steel, this jaw set has a smooth, non-marring external and internal gripping surface, with rounded corners to reduce the risk of injury from contact with the spinning jaw.
This jaw set has internal faces that are stepped to accommodate a range of three different tenon sizes, for large work up to 20" in diameter. The external sizes of the jaw are 2 1/2", 3" and 3 1/2". The internal size is 4 1/4". Jaw length is 1".
External and internal sizes are optimal; recommended for tenons and recesses up to 1/4" larger than the listed sizes.