These diamond plated laps are manufactured exclusively for His Glassworks right here in North Carolina. We use a copper laminated fiber-board substrate (similar to computer circuit board material), with 100% natural DeBeers diamonds electroplated onto the surface with nickel. This creates a highly durable, rust free disk for all your grinding needs. The back of the disk has a rubberized magnet applied to it which allows for easy application to the metal wheel head of your grinder. This magnetic system makes changing from one grit to the next extremely easy. If you don't currently have a diamond grinder, please consult our Flat Lap Machine page for options. If you have any questions about their lifespan, usage, and speed please consult our ,Please feel free to call for advice on the system best suited for your specific grinding needs.