Designed to give access around the jaws for close-in tool work. With a deep recess for holding long spigots and giving rock solid mounting when turning a long way from the headstock without tailstock support. The jaws are also dovetailed both inside and outside on the lip. Three sizes are produced - the size stated is the nominal external dovetail grip. The 50mm jaws are drilled and threaded to accept additional jaw inserts to convert to smaller jaw diameters. Suitable for 100mm and 114mm chucks only. N.B. The finish may be either silver or black due to changes in legislation regarding passive zinc plating.