A better way to smooth bottle edges! Grind away burs and smooth glass edges with these handy abrasive stones. Safer to use than sand paper, stone keeps your hands safe from glass while grinding away burs and smoothing bottle edges. Use the rounded side to easily smooth inside the curved edges of bottles and jars; use the flat side to sand and smooth edges. Simply dip your stone in water to lubricate and minimize glass dust. 1/2" diameter is even small enough to grind narrow bottle necks. Stones feature a fine 180 grit. 6" long with a 1/2" diameter.