Increased Cutting Speed 118 degrees split point tip provides faster cutting and prevent sliding while increasing the wear resistance Titanium Coating Titanium coating ensures outstanding durability and sharpness which can reduce the friction and run cooler Brass core reduces shaft binding Diamond abrasive bonding surface is double plated for strength and long life. Application: Suitable for shaping and drilling tile, glass, stained glass, stone and other hard material. Specification: Material: Brass, Chrome-plating. Finish Type:Chrome Color: Gold. Size: 1", 3/4", 1/4",1/8".The hole diameter?8mm/0.31in. Package Included: 1 x 1" Standard Grit Stained Glass Grinder Head 1 x 3/4" Standard Grit Stained Glass Grinder Head 1 x 1/4" Standard Grit Stained Glass Grinder Head 1 x 1/8" Standard Grit Stained Glass Grinder Head 4 x Allen Wrenches