Shapton cast Iron Lapping System
The Shapton DGLP Diamond Glass Lapping Plate is famous around the world, and for good reason. It's not cheap, but it strives for perfection and performance unlike any other diamond lapping plate on the market. The performance is amazing and it is known to be as perfectly flat as is possible.
This DGLP is capable of lapping stones up to 30 microns (500 grit or above). It should not be used on rougher stones, as that would dramatically reduce its usable life.
Here's what Shapton says:
Most users find the capabilities of Shapton's DGLP astonishing. The sharpest cut is born when two steel planes cross at an acute angle. Yet every time a blade is sharpened on a sharpening stone, the stone itself changes shape, so over time, the planes at the blade's edge also change. That is why it is so important to keep the sharpening stone itself flat. Apply the DGLP, and you will enjoy sharpening as never before. The DGLP uses glass for its base, and this is what produces such high precision on the resulting sharpening stone plane.
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Dimensions: 253 x 80 x 24mm (Working surface 245 x 72mm)