IFOLAINA Pack of 10 3D Laser Engraving Crystal Glass Bubbles Ball Cabinet Knob Cupboard Drawer Pull Handle 30mm Crystal and Zinc Alloy, Practical and Economical for Decoration Size: 1.18"*1.18"*1.57" Fasten Crystal Ball To The Base With Powerful Shadowless Glue Tightly Without Any Damages on the Appearance of Crystal Ball Apply to Cabinet, Bookcase, Doors, Dressers, Drawers, Wardrobe, Kitchen, Cupboard, etc. Comes with Screws for Easy Installation First you need to find the position where you want to install on the board and drill a hole. Then pass through the screw from the back of board and thread tight to the knob. Be careful during the work. Finallycheck if the knob isfixed on the board tightly.