Door handle knob material: Zinc alloy with black finish Door knob size: L60x30mm and screw diameter: 5.6mm To fit Min 5mm & max16mm diameter open hole in your glass and it can be used in most of the glass doors at home or office. DIY replacement: It is easy and convenient for this door knob DIY replacement; you can simply twist both knobs by your hand to replace with the new knobs on glass doors. Package includes: 1 pair door round knob (1 pair = 2pcs knobs)., Manufacturer: KANDO