- This 1/4″ grinding bit can be combined with the Glastar Adapter to use on most standard glass grinders. The newer Glastar grinders had a threaded shaft , where the larger bit sits, and could screw the 1/4″ bit directly on the shaft. You will need to hold a wet sponge next to the 1/4″ bit while grinding to keep it lubricated. You can also use this bit to drill holes with your glass grinder
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