Our compact 6-N-1 key gauge is designed for Schlage, Kwikset, Medeco, Yale, Master and Sargent. Slide a key in and instantly find the appropriate pin. It also includes a handy half moon cutout for C-clips. The handy 6-N-1 key gauge measures an easy to carry size of 3.875”L x 2.130”W x .038” thick.