For 3/8" Glass Complete with Matching Finish Plated Keeper Installation Requires Drilling 1" (25 mm) Diameter Hole in Glass Chrome or Gold Finishes Finally, CRL has locks available for 3/8 inch (10 millimeter) glass doors. If you work with glass you will really appreciate these attractive and compact CRL Chrome Plated Glass Door Cylinder Locks with Matching Keepers. Locks come complete with two brass keys, four washers and keeper. Customers needing extra keys can order LKEY which is the blank key for this lock. Order Keyed Alike when you want more than one lock.