AP-446-S2 SineSet angle plate features a precision-ground steel construction with a series of tapped and through holes for versatile workholding. This 4″ x 4″ x 6 single-piece angle plate is designed for high-accuracy machining and inspection setups, providing a stable 90-degree reference surface. The unit shows signs of previous use including surface staining and light oxidation consistent with a machine shop environment but remains structurally sound and functional. Thank you for visiting my store. I appreciate your business.