The Thomas & Betts Steel City OWC Support Clip is a sturdy mounting solution for installing old work electrical boxes into existing walls. Made from durable alloy steel this clip provides a secure and reliable hold. It is designed to adapt to any wall thickness up to 3/4 inch and locks steel switch boxes tightly in place. This clip ensures a professional and stable installation for electrical outlets and switches in plaster drywall concrete block brick or concrete surfaces.