50 Degree Honing Kit by Bridge City Tool Works 

The 50° Mini Honing Guide Kit allows you to hone the special HP-8 Mini Block Plane and/or Chopstick Master Plane irons to precisely 50° for planing highly-figured or reversing grains in your work piece. Includes 1 Hardened steel iron and 1 honing plate. 

(Note: The 30° Honing Guide is not included. It is only pictured here to demonstrate the set-up for the 50° Honing Kit).