Dia-sol discs for the Q-6R and Flex Electra hand machines have a longer life than the Electroflex disc. Rather than a single layer or diamond, the diamonds are mixed into a resin disc. As one diamond comes to the end of it’s life it is released and there is another one waiting below. The Dia-sol disc also offers a smoother finish and is typically used for bevelling. M14 fixing. For wet use.