【Forehead Bracket】Computer forehead rest is designed as a forehead support chin rest for computer optometry, which effectively supports your chin while helping you get a proper optometry experience 【Material】Forehead Support Chin Brace This tool is made of plastic, aluminum alloy, stainless steel, electroplating process, rust-proof and more , this product is rust-proof and very 【Optometry Chin Support】Our brackets are designed to support your chin while still helping you get the right amount of vision 【Lift Adjustment】The adjustable knob allows for easy customization of the lifting distance, with a maximum lifting distance of 10cm(4in). This ensures that you can easily adjust the bracket to suit the specific needs of each patient, providing a secure and comfortable fit 【Scope of Application】Widely used in optical shops, optometry centers, eye care centers and other places, automatic refractors, vision training, optical instruments