Lock-Mitre Cutter — Profile 020, Single T&G (3-pc Set), Pro-Line (1-1/4″ Bore, 5-3/8″ OD)

The FB-LM-PL-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. Pro-Line: 1-1/4″ bore, 5-3/8″ cutting diameter, three wings, counter-clockwise, carbide or T-Alloy. The Mini-Pro counterpart is MC-68-020.