Record Power 50 mm Standard Jaws50 mm Standard Jaws 62313 Featuring a specialised dovetail profile in expansion and the superb grip of the hawk beak design on contraction, these versatile Record Power jaws are a great all round set, capable of bowl work to a good size and also spigot turning. They are also supplied as standard with the SC3 and SC4 chucks. Expansion: 52 72 mm Contraction Spigot: 42 61 mm Contraction Square: 30 51 mm