Hollow shutter glass is a product which installs aluminum blinds into tempered insulated glass, through magnetic control, the blinds in the insulated glass can raise and lower, tilt nearly 180 degrees on level. The user can control the handle to adjust the blind slats to make glass be full shade, semi-transmit light. The product will take its energy-saving and shading effect into full play when combining with aluminum or plastic steel doors and windows system. https://www.fmblinds.com/Hollow-Shutter-Glass-Gray.html