@huang.chang.tools: THIS 40mm 1.8mm ripple diamond carving wheel? It's the BIG WINNER. Super thin 1.8mm cut for tiny clean lines, radial wave slots cool down instantly, zero burnt stone every time. Solid 5/8"-11 aluminum shank fits every American flex shaft engraving machine, no flimsy adapters needed.#anglegrinder #diamondwholesale #huangchang #diamondpainting #worktools