The perfect fix for undersized plywood flat panel “Mission Style, Arts & Crafts and Shaker” cabinet doors. Set includes unique adjustment system and a gauge for precise settings. Designed to cut precise grooves to provide undersized plywood veneered panels with a snug, rattle-free fit. For 5.5mm undersized 1/4″ plywood. For 5.9mm oversized 1/4″ veneered plywood. Adjust the panel groove width 3/16″ to 5/16″. Cut frame stock from 5/8″ through 1-3/16″ in thickness.