Bolt locks securely into frame of patio door. Key operated with tamperproof screws. Can be locked partially open for safe ventilation. Resists prying or lifting door out of track in locked position. For use inside and outside. Operated by key or lever. Painted aluminum finish. Furnished with 2 keys. 5-disc tumbler mechanism. Keyed alike. For replacement keys use E-Z model No. IN29.