Attributes:* Drilling Dia.: 22mm / 7/8"* Shank Dia.: 7mm / 0.28"* Drilling Depth: 34mm / 1.34"* Total Length: 51mm / 2.01"* Material: Diamond Mild Steel and Alloy Steel* Finish: Nickel PlatedWhat Is Included:* 2 Pieces x Diamond Hole Saws Drill BitApplications & Features:--- The electroplated diamond drill bit is used for drilling through glass ceramic tiles marble stone glass bottles and pots and other similar materials. The diamond hole saw cannot drill through tempered glass plastic wood concrete or for depths beyond about 1/2". Always use water as a coolant or lubricant in the drilling area to keep it cool and extend its service life. The diamond coated drill bit can be used with handheld drills or bench drills.