As we all know wafers in locks wear, and they can bend and stick up into their chambers. That is often true if the wrong key is inserted. Such a stuck wafer will now prevent the lock from turning - even if the correct key is used. Peterson's Wafer Doc Repair Tool is a double ended wonder! Its sharp pointed end pries the most stubborn frozen or encrusted wafers into place. The super strong pulling probe straightens out bent wafers. Such a simple tool that does so much,. A locksmith's best friend when servicing seldom used, worn or abused wafer locks. Ask any professional that has used one; this little tool will quickly earn its place in your tool set many times over!