Key decoders are esential to a toolkit as they allow you to quickly decode the cuts on a key. With practice decoding a key can be done in seconds. The 5 in 1 decoder works with Kwickset, Master, Schlage, Weiser and Westlock keys. Knowing the decoded numbers to a key allows you to cut a diplicate key or rekey a new lock with the measured heights of each pin. Sparrows Key Decoder is made from 2mm plated steel and is precision laser cut with laser etching.