... hiding at side or showing on face(5.) Quality Standard:A GradeNo dead knots (pin knots allowed, <1mm), little ... sound knots, <5mm, mineral lines & sapwood, B GradeDead knots <5mm, sound knots<10mm, sapwood & mineral lines.C ... board , finger jointed boards. These can be used for furniture, coffin, door, and other building material. Finger Joined Boards of pine,china fir,paulownia ...