this is a BEST brand Interchangeable core type knob lockset. removing it from the door is easy..even you dont have the manufacturer spanner key. see the alternative tools in removing such lockset. thanks for watching. regards
Drop forging is a forging process where a hammer is raised and then “dropped” onto the workpiece to deform it according to the shape of the die. There are two types of drop forging: open-die drop forging and closed-die drop forging.