Air Grip Group Of Companies offers Electrical Wiring Step Plug. Air Grip Group Of Companies is an ISO 9001: 2000 accredited company. The Electrical Wiring Step Plug comes in different sizes with the tolerance of + 0.05mm along with internal and external threading of metric thread, BSP, BSPT and NPT. The Step Plug is brass forged and is made up of brass rods, tubes and profiles. The Electrical Wiring Step Plug is available in various ranges from 10.00mm to 100mm.