Valenite ( a Walter company) indexable boring bar, model S20U-MWLNR-4. 20 mm shank diameter. Right-hand boring bar designed for internal turning operations. Accepts standard WNMG-43 (WNMG 432 / WNMG 431) style carbide inserts. Used tool. See photos for exact condition and all markings.

• Made in the USA. 
• Solid steel construction.
• 4x new Iscar WNMG-431-GN inserts