At 63mm (2 1/2")diameter and suitable for 1" x 8tpi or 3/4" x 16tpi thread sizes, this little chuck is sure to prove popular with turners of small scale and miniature items. Key operated for one handed operation; the scrolling action is very smooth and gives an extremely positive grip. Complete with a comprehensive range of additional jaws and a screw chuck adaptor it will be suitable for a host of different applications. 24 position indexing is possible as the backplate has provision at the rear and around the circumference. Precision engineered and a joy to use, this is a great package and excellent value too.