Griffin Glass plates are sanded and polished to a fine 400 grit finish on all sides. The round graphite rods are also sanded and polished to a fine finish with a tolerance of .005+/- on the diameter of the rod. The rods are 12″ long and have unfinished ends (not shaped or rounded over). Both plate and round stock are made from high grade isostatic tight density graphite. This plate is 6″ x 6″ x 1/2″ thick. (36 square inches).