Rockwood manufactures high-quality hinge pin stops ideal for use with solid-core and thick doors to prevent the doorknobs from punching holes in drywall surfaces. These 528 Series stops feature tough wrought-steel construction with pre-equipped rubber bumpers for impact resistance and are compatible for use with both 1/4 and 5/16 inch hinge pins. These ANSI-rated door stops provide a slip-proof door opening adjustment between 70 & 100 degrees and also have a bright brass- / nickel-plated finish for anti-corrosion performance & a reflective appearance.