Mirror polished finished carbon steel body with 21mm socket for use with ratchet wrenches. May also be used with a 23mm spanner. Heavy-duty double chain. Double chain for an extra heavy duty hold on the oil filter. Suitable for filters up to 120mm Diameter. To use simply slip the chain around the filter to be removed and turn the hexagonal bar anti clockwise to grip and unscrew the filter. Specifications: Double chain. Heavy Duty. Suitable for Filters up to 120mm in Diameter. 21mm Socket or 23mm spanner. Mirror polished finish. Professional use.