Tight, solid knots, small pitch pockets and small, tight cracks are acceptable for this grade. Imperfections that interfere with the structure and functionality of the box are not accepted. Black knots larger than a quarter dollar are not acceptable. Fingers and rabbet ears must be free of knots. Knots with cracks going all the way through, as long as the knot is solid are acceptable. Small Knots in the hand hold are acceptable, unless in the thin part of hand hold. Black edge knots or planer skips with ½" (1.27 cm) thickness or less can me missing from the top or bottom of the board.
Available in both 8 and 10 frame equipment.
Shallow, medium and deep. (shalloe not available in 8 frame equipment)