The Master Lock 6400ENT Bluetooth ProSeries Padlock allows professionals to manage and monitor access wherever a standard padlock would be used. Featuring a 2-7/16 in. (62 mm) W metal body for durability and security. The 11/32 in. (9 mm) Dia shackle offers 1-3/8 in. (34 mm) vertical clearance and is made of boron alloy, offering maximum resistance to cutting and sawing. Weather cover provides enhanced resistance to perform in snow, rain and temperature extremes. From job sites, telecommunications to keeping facilities and equipment safe and secure, the Master Lock Vault Enterprise system is designed to enable a professional-grade remote access system - whether with a single lock or thousands - with unmatched security, simplicity and accountability. Administrators can control individual or system-wide lock access with our convenient web interface, while users enjoy simple, secure access to assigned locks or lock boxes. Color: Black.