Yale Real View It does not need additional holes. Replace the standard sight glasses. Suitable for children and seniors. Increase the security of your home. For doors from 32 to 50 mm thick. Peephole for holes from 14 to 22 mm. Includes batteries. 2 AAA units. Duration of the batteries: 600 uses. SKU Description 0009026 Yale Real View Related Products: Yale Real View Pro