Helix design allows water to be pulled up to grinding surface without the use of a sponge, or use your sponge and always be sure you're getting water to the bit.All Glass Grinder Bits are electroplated by our factory. Because we plate our own diamond products we can offer the absolute best drums at better prices than anyone else. The diamond coating on your HANS drum will never peel from the drum or we'll replace it for free for the life of the diamonds. And to help you find the right bits for your machine and the task at hand, HANS bit suit for the Glastar,Inland,Gryphon,Twofers,Mika Elite and Durabits glass grinder machine.