What You Will Get: The package includes 50 pieces of jack flange short nuts, providing sufficient quantity for use and replacement, meeting your practical needs Detailed Size Information: The expansion nut measures 4x20mm in threaded insert, with an inner ring diameter of approximately 4.44.6mm; compact design for easy installation Safe and Reliable: Made of quality steel material, the expanding nut features a galvanized surface for enhanced durability, corrosion resistance, and strength; resistant to breakage and deformation for reliable performance Convenient to Install: Drill a hole in the desired location, insert the anchor until flush with the surface, remove the screw, thread it through the component, reinsert into the anchor, then tighten securely Wide Application: Suitable for use in wood, soft thin walls, hollow walls, gypsum board, and thin metal plates; when tightening screws or bolts, secure the nut in place without over-tightening to prevent thread damage The jack flange design increases the contact area with the surface, enhancing load-bearing capacity and stability Notes: Contains pointed items; use caution during handling, wear protective gloves to avoid injury, and keep out of reach of children Color: Silver Material: Steel Dimensions: 13.49 x 13.41 x 2.21 cm; Tube length: 16 mm Package Contents: 50 x Short metal nuts Note: Light reflection and display differences may cause slight color variations between the image and actual item. Measurement tolerance: 13 cm