These clips are for the Anycubic Kossel Plus, allowing you to support an Anycubic 220mm diameter x 3mm aluminum heated bed directly under the stock 240mm diameter glass bed. They utilize the same bolts and nuts used to mount the stock bed clips. They feature slotted holes to allow for bed adjustment as required. The clips also provide 3 support points for your bed in total rather than six. This means it will not rock between support points.