Use on door where security is need,turn interior locking,exterior locking using a Keys. The door handle set is make of stainless steel parts,covered with paint,waterproof and rustproof,Enduring. Easily to install: Door handles have mounting holes in the center; includes spindles and fasteners and all accessories need for installation. Door handles can be used on both left and right closing security door,Security Screen Door Handle,sliding door handle. It can be used on wood door,security door,screen door.It can be used on both indoor and outdoor door.