These Nieckel Bonded diamond magneticdisc , diamond magentic backing,laps and diamond magentic backingdisk are manufactured exclusively for Glassworks right here by Hans  Superabrasive for Grinding, Shaping and Polishing. More diamonds means more than just fastergrinding.Metal Bond Diamond Discs, have diamond particles held firmly in place on a rigid backing. The diamond particles are electroplated for maximum bond strength and heat dissipation. A hard nickel alloy is used to rigidly bond a layer of sharp, blocky diamond to a steel plate. The sharp diamond particles cut cleanly with no edge rounding. These Metal Bond Diamond Grinding Discs radically reduce the time required for material lapping and grinding. Metal bond diamond grinding discs are available with either magnetic or PSA backing.We use 100%  diamonds electroplated onto the surface with nickel. This creates a highly durable, rust free disk for all your grinding needs. The backof the disk has a rubberized magnetic 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. Diamond Magnetic Flat Disk

only 2.3mm thickness with magnetic backing, It easily rectify the distortion of disc and flat attach it to plates of grinder.