This set consists of a steel 4 blade cutter or a 2 blade carbide cutter. The steel cutter is fairly dull and cuts slowly. The carbide cutter will cut aggressively and is more likely to tear out end grain. One of four inserts goes through the center of this, and is held in place with a set screw tightened using the attached Allen wrench. (The set screw for the carbide cutter appears to use a different sized Allen wrench!) the following inserts are available to square pens with tubes of the following diameters:
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[[File:619F9889-2750-4F7C-9799-299321D3D910.jpeg|thumb]]This set consists of a steel 4 blade cutter or a 2 blade carbide cutter. The steel cutter is fairly dull and cuts slowly. The carbide cutter will cut aggressively and is more likely to tear out end grain. One of four inserts goes through the center of this, and is held in place with a set screw tightened using the attached Allen wrench. (The set screw for the carbide cutter appears to use a different sized Allen wrench!) the following inserts are available to square pens with tubes of the following diameters: