100% new and high quality.Diamond glass marble tile cutting.Simply mounted on the ordinary hand drill can be used, need to add coolant when drilling, drilling force should be playful, especially when at the beginning of the drill and to drill through.After notching easy decoration, chip easily, no distortion, good stability.Apply to ordinary glass tile openings, rounded beads, etc., mainly used for glass openings.Product name: Diamond Material: metalColor: Silverdiameter: Approx. 20mm/0.78 inch , 26mm/1 inch , 30mm/1.18 inch , 35mm/1.37 inch , 42mm/1.65 inchBlade length: Approx. 3mm/0.11 inchLength: 50-50mm/1.96 inch -2.16 inchShank Diameter: Approx. 7-8mm/0.27 inch -0.31 inchQuantity: 5pcsWeight: 146gPackage Contents:1x 20mm with 7mm dia. Drill1x 26mm with 7mm dia. Drill1x 30mm with 7mm dia. Drill1x 35mm with 7mm dia. Drill1x 42mm with 8mm dia. DrillOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.