What You Will Get: the package comes with 50 pieces jack flange short nuts, and the quantity is enough to use and replace in , meeting your use demands Detailed Size Information: the expansion nut measures 4x20 in threaded Insert and the inner ring is around 4.4-4.6mm, is compact and Safe and Reliable: made of quality steel material, the expanding nut is galvanized on the surface, solid and durable, corrosion resistant, not easy to break or deformation, can be applied with confidence Convenient to Install: drill the holes in the right , adjust the anchors into the holes until they are flush with the board surface, remove the screw and thread them through the , put them back in the anchors, then tighten the screw until secure Wide Application: petal metal nuts are appropriate for wood, thin soft wall, hollow wall, gypsum board, thin iron plate and more; When tightening the screws or bolts, it is recommended to just crimp the nut and fix it in place, do not overtighten, otherwise it may cause the threads to come off The design of the jacks flange metal nut makes the contact area with the contact surface larger, thus improving the bearing capacity and stability of the nut. Notes:Pointed items are included, it is recommended to wear tool gloves to avoid injury when using and please keep them from kids Colour:Silver Material:steel Size:13.49x13.41x2.21cm,Tube length:16mm Package Contents: 50 x short metal nuts Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.