Used for supporting of round and square jobs during Light machining, Grinding, Drilling & Inspection. Accuracy for Flatness, Squareness and Parallelism within ±0.003mm. Hardness 60±2 Rc. Supplied in perfect matched pair. Supplied with clamp. Can also be used for end face, side face and right angle Grinding Size 25L X 20W X 20H 50L X 40W X 40H 80L X 63W X 63H 100L X 80W X 80H