Shaft diameter is 16mm, compatible with 16mm (5/8in) diameter lathe tool base. Woodturning tool rest features a 6.5in span and an overall vertical length of 2.95in. Unique curved design with a concave profile for comfortable grip and stable handling, allowing easy access to the interior of bowls. Constructed from solid steel with a hardened steel rod top that resists nicks, scratches, and rust. Offers high hardness and long service life. Smooth, round hardened steel surface allows lathe tools to glide effortlessly for precise control and superior results. Suitable for bowl exteriors, interior hollowing, deep reach work, and tight corners. Compatible with most mini lathes and wood lathes. Includes 1 x Lathe Tool Rest.