[Features] ● A joint system for easily attaching single-groove aluminum frames. ●Single-groove aluminum frames can be easily joined together with a single screw without the need for nuts or positioning. ●Can be used for aluminum frames of various companies. ●There are M5 screw holes on both sides, and 5mm acrylic panels can be attached by changing the direction of the joint cover. ●The panel with holes can be attached to the inside of the aluminum frame. ●Since it has a panel mounting function, you can easily create a partition to prevent droplet infection.