Strain Relief Cord Grip Cable Gland w/nut Wire 1/4 " NPT Stainless Steel Waterproof Cable Gland with Nut Adjustable 3-6.5mm Cable Gland Protectors. Strain Relief Cord Grip Cable Gland w/nut Wire 1/4 " NPT Stainless Steel Waterproof Cable Gland NPT1/4" Stainless Steel Cable Gland 3-6.5mm Waterproof Cable Protectors.Size: 1/4" NPT, Cable range: 3mm - 6.5mm Made of stainless steel, waterproof and corrosion resistant,long service life. It has good water resistance and will not seep through long-term use Easy installation,Plug the cable directly in, just screw the cover Widely used in electrical junction boxes, electrical cabinets, electrical boxes in power plants, etc.