Vista's On-The-Shelf tungsten carbide EDM Plus Blocks are available in the following sizes. If you need a size not shown on the chart, we will be happy to talk to you about adding your specifications to our On-The-Shelf program. We offer 3x4 EDM Plus Blocks in the following grades; VM-15M+. Click to view 3x4 Block Chart. We also offer 4x4 EDM Plus Blocks in the following grades; VM-11C+ ,VM-15M+. Click to view 4x4 Block Chart.