[Basic Info]: Matrial: Durable Clear Glass and Zinc Alloy Base; Color: Black; Suitable for conventional and modern decoration, add an elegant look to your home. [Dummy Function]: Non-functional and used on doors where only a pull is needed. The dummy or inactive function is surface mounted on doors and do not turn or lock. [Universal Preparation]: Fit doors thickness: 1-3/8” to 1-3/4” (35 to 45mm), reversible for left and right hand doors.Note: You need to drill a 54mm hole to install in order to prevent the risk of knob falling off the door. [Easy Installation]: Easy to install with all accessories included. The easy installation makes for a one-person project. Install these simple decorative door knob throughout your home for a timeless look. [Servive]:Happy purchase without worries! Any quality problems will be handled by professional customer service staff. Do you want to rebuild your house with a dreamlike and shining look? Orger Provide different style of crystal door knobs and other home improvement hardware.