GearWrench 3942 Medium Pro Swivoil Filter Wrench The GearWrench 3942 Medium Pro Swivoil Filter Wrench features 180° swivel action, cushion grip dual material handle that provides greater comfort, and stainless and plated steel material band for lifetime corrosion resistance. Also featured on the GearWrench 3942 Medium Pro Swivoil Filter Wrench is a dimpled handle for extra gripping power, and is specially designed to fit today’s oil filters.