This Suburban Paw-060606 Webbed Angle Plate is a great tool for your surface plate collection. The ribbed construction makes it extra thick, allowing you to use the sine bar with heavier objects. The 6" x 6" angle plate has a parallelism of 0.0002 in., and comes with machined finish. This cast iron surface plate is very durable and can withstand heavy weight without warping or bending. If you are looking for a reliable sine bar, this Suburban Paw-060606 Angle Plate will make an excellent addition to your tool kit.