Our 84" (2134 mm) Double Locking Ladder Pulls have a fully concealed deadbolt locking mechanism that is operated at 47-1/4" (1.20 m) above the floor. No need to bend, simply turn a key or thumbturn located at a comfortable height above the finished floor to lock or unlock your doors. These Locking Ladder Pulls are intended for use with glass doors made from 3/8" to 1/2" (10 to 12 mm) thick tempered glass. They lock both at the header or transom and floor for ultimate security. Two Cat. No. 58DKBS Dustproof Keepers are included with each Locking Ladder Pull. Optional Ladder Keeper for glass transoms is available separately (see top right). This Locking Ladder Pull is supplied with our standard 7-pin Rim Cylinder with Interchangeable Core, that can be used as the final cylinder or as a temporary, and is easily replaced. If staying with the 7-pin format, just remove the core, have it re-keyed, or replace it with a new one. If proprietary 6-pin Cylinders are required, simply remove the entire Rim Cylinder provided and replace with the proper Rim Cylinder of your choice. This Ladder Pull will accept most standard manufactured Rim type cylinders.