Van Dykes offers a wide selection of brass and steel skeleton keys to replace lost keys for your heirloom pieces. Fitting a replacement key to a lock is a relatively simple process. First, look at your lock to determine whether or not it has a pin showing in the keyhole. If so, measure the pin diameter. If your lock does not have a pin showing, select one of our solid shank keys with a bit size closest to the size of your keyhole.