This product is a cabinet handle, designed to fit Ikea KNOXHULT cabinet doors that are 16.4mm thick. The handles require no drilling or holes as they are designed to fit tightly on the cabinet door through friction. If you want a tighter fit, you can use double-sided tape or insert a piece of thick paper. The handles are marked L and R for the relevant side, but you can also swap sides and use them vertically instead of horizontally.