Kent All Purpose Bottle Cutter Machine Set with Diamond File and Core Drill Bits Create Functional art while recycling glass bottles and jars Bottle Cutter with Durable metal construction and Carbide Cutting Wheels Super Fine Diamond Coated Hand File to Sharpen the Glass Edges 10pcs Assorted DIAMOND COATED CORE DRILL BITS, 3mm to 12mm (3/8" to 1/2") Easy to Use