Specification: Type: Core Drill Bit Material: Diamond Coated Application: Excellent for making clean and accurate hole on glass and tile 15pcs 6-50mm:(6/8/10/12/14/16/18/20/22/25/26/28/30/40/50mm) Note: Please allow 1-3mm error due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package Included: 1 Set Diamond Drill Bit