The CRL Keymatic Sliding Door Plunger Lock can be installed to engage either by pushing into a drilled hole, or resting against the edge of the back sliding door. This Lock is excellent for any wood or plexiglass sliding door application. For glass doors, we have Cat. No. KML41GL Sliding Glass Door Plunger Lock. Lock features captive operation so key can only be removed in locked position. Fits doors up to 1-1/32" (26 mm) thick. The exclusive Keymatic Cylinder allows combination changes using the Keymatic Master Combination Key.