External burr - a cutter designed for rounding of metalóelements, wood, etc.  The body is a metal, conical funnel with a hexagonal shank /take/ for attachment in the drill.

• Total height is 49 mm.
• Inner diameter: at the bottom 19 mm, at the gór 3 mm - this is the working range.
• Depth of about 12 mm. 

In the body there are three steel cutting blades /cutting inserts/ with a width of about 1.5 mm, made of YG8 carbide. The material of the inserts allows efficient rounding of rodsóin stainless steels, hardened steels, copper, brass, aluminum, fiberglass, wood and plasticsóin. An important application is smoothing the endsóof threadsóon screws or rods. The rotation of the drill should be adjusted according to the material to be worked on.