A granite surface plate is very useful in a woodworking shop, particularly for checking plane bottom flatness as well as for lapping planes, using the plate as a bed for PSA-backed paper. Superb quality, this plate is 2" thick, 9" × 12" overall and weighs 25 3/4 lb. Obviously it is moisture and corrosion proof. It is also accurate to 0.0001" overall. Excellent buy.