This is a seat locker, a jig that secures the seat when folding a folding wheelchair. Are you having trouble with the seat opening when loading or transporting your wheelchair in a car? Normally, the seat will open slightly when folded as shown in the third photo, but this jig can be used to secure it. It is easy to attach and detach. It doesn't take as long as securing it with a belt. It also prevents the seat from opening when loading it into a car. Applicable wheelchairs have a seat pipe diameter of 19mm or less and a folded width of 70mm or less. The wheelchair in the photo is an OX Engineering GWXⅢ. Dimensions can be changed. Please consult us in advance. It is made with a 3D printer. It will be made and shipped after purchase, so it will take a little time.