Yale P-M444-PB Door Security Bolt, Polished Brass Finish, Standard Security, Visi Packed, Suitable for Hinged and Wooden Doors The Yale P-M444 door security bolt is a simple to install solution to help you protect against potential break ins. This product is suitable for wooden doors. The door bolt is concealed within the door for extra protection making potential break ins a lot more difficult. Simple, effective security that anybody can install giving you that additional level of security for the ultimate peace of mind. About this item Key operated Concealed Door Bolts Mortice fixing with bolt throwing in to the door frame Recommended that 2 bolts are used per door Key supplied. Door bolt is concealed within the door Suitable for wooden doors Lock can only be operated from inside Additional security, ideal for internal and back doors Brass finish