Standard 4020 Series Closer Is Shipped With Regular Arm, Standard Plastic Cover, And Self Reaming And Tapping Screws Non-Sized Cylinder (4021) Adjustable For Interior Doors To 4’6” And Exterior Doors To 3’6” Closer Mounts Top Jamb (Push Side), Left Swinging Door 4021 Cylinder Meets ADA Requirements Standard Aluminum Powder Coat Finish