Five piece turning tool set in box, To use with: Proxxon 34004 Precision Lathe PD 230/E, Used to clamp asymmetrical pieces such as rectangles, The reversible jaws clamp from 0 to 1 3/8"" (0 - 35mm) inside and 35/64"" to 2 5/8"" (14 - 67mm) outside, The Proxxon 37 020 headstock spindle of thread M 16 x 1 screws directly into the chuck, SKU: PXTECH173