Birch log,ABC grade diameter:18cm+up Possible lengths 3,4; 4; 5; 5,4 m., Minimum order is 200 m3 Loading port is Saint Petersburg, Russia Allowed healthy knots, no limited, but the maximum knots diameter 6cm, allowed unhealthy knots, maximum one knots each one meter, not allowed branch, rot, crook 2%., Fresh cut logs, brown or red heart: not exceed 50% of diameter at the measured Measurement: measured by the diameter of the thinner end of the log (under bark). Should be according to GOST
