A delux half cylinder is a type of lock that has a keyhole on one side and a knob on the other. It is used for doors that need to be locked from the inside, such as bathrooms or bedrooms. It has a 5-pin mechanism and a brass body Specification : Brass Computerized 5 Key ensure High Security, 6 Pin mechanism which have 6 lateral pin, Can be Euro Profile Lockbody, Also used in Sliding Lockbody.