Gel Bits are an economical and attractive brand of bit that's designed to fit all glass grinders. Features include bright, neon colors that corresponds to its grit for easy identification and a polymeric holder that absorbs shock and reduces chipping. All Gel Bits use high-quality diamond grit mesh for a long life. They disengage from the shaft easily and quickly. Compatible with all major grinders types. 1" diameter Ultra fine 600 girt.