This is the ultimate tool for flattening edges adjacent to walls/ perpendicular surfaces. This is typically used on a control surface inner edge near the cut.
The block features a lightweight yet flat and very strong aluminum profile with carbide sanding compound on both sides. One side features coarse grit, the other side features fine grit.
The carbide surface is almost indestructible as long as you don't try to sand steel, alloy, glass or stone with it!
It can be dry cleaned with a bronze brush when getting dirty.
The blocks are available as 51 mm height, with a 45 degree end the following lengths: