Get WESTCables non-metallic buckle which is safe to use around electrical and magnetic fasten Size: 3/4" X 10". The non-metallic buckle is harmless to use electrical and magnetic. Its size is about 3/4" X 10". At least 2000 re-fastenings. Permanently attachment with solid brass grommet with an ID of 1/4". It can be attached with a metal fastener to carts, equipment racks, walls and van interiors.