Micro-Flat Datums Pvt. Ltd. Offers Cast Iron Slotted and Webbed Angle Plates. Micro-Flat Datums Pvt. Ltd. Has been awarded ISO 9001:2000 certification. Cast Iron Slotted and Webbed Angle Plates are used for clamping and work holding in vertical position and as vertical reference for layout, machining and inspection. Cast Iron Slotted and Webbed Angle Plates make ideal fixture for shaping, planning, milling, grinding, horizontal boring and drilling operation. The plates is made from high duty closed grained cast iron casting conforming to grade FG-220 of IS-210.