16 X 12 X 9″ Giant Slotted Angle Plate ~ Machined on outside faces and with cored slots arranged for maximum clamping versatility. ~ Made of high grade, close grained cast iron that has been stress relieved against distortion. Parallelism and squareness tolerance is 0.008″/per 6″. A is 16. B is 12. C is 9. Machined on outside faces and with cored slots arranged for maximum clamping versatility. Made of high grade, close grained cast iron that has been stress relieved against distortion.