These are awesome metal tool cleaning and polishing blocks. I always have a few around the shop.  Their uses are endless but I mainly use them like an eraser to clean off surface tarnish and light rust from my planes, chisels, and other metal tools. 

They are made of a semi flexible rubber compound with silicon carbide abrasive grits impregnated throughout the entire block.  I prefer the Medium grit (green) for most of my tool cleaning chores.

  • Kit contains one block of each grit: Fine, medium, and coarse.
  • Each block measures 3-1/4" long x 2" wide x 3/4" thick. 
  • Made in Germany.
  • You can "carve" the block into any shape to clean up a concave or convex surface
  • As you use it new grits are exposed - it never dulls!