Lock-Mitre Cutter — Profile 020, Single T&G (3-pc Set), Mini-Pro (3/4″ Bore)

The MC-68-020 cuts a lock-mitre corner joint — a 45° mitre combined with an interlocking tongue-and-groove that self-aligns during glue-up and adds strength, so corners hold registration without complex fixturing. It is a single tongue-and-groove lock-mitre set (three-piece), for stock up to 1-1/8″. Profile 020 sizes the joint for a specific material thickness; match the profile number to Freeborn’s lock-mitre chart for the exact range. Mini-Pro: 3/4″ bore, three wings, counter-clockwise, carbide. The Pro-Line counterpart is FB-LM-PL-020.