Hzhongyou 12pcs m4 x 20 jack nuts expansion nut petal rivet expansion clamp hollow wall iron skin line

Label:yes nut sizes: m4 material: zinc plated total length: 22.

7mm nut type: jack nuts screws external diameter:12mm the sheet metal had holes that were stripped.

used these nuts and they worked perfectly.

the brace is installed, and the upper part of the door is also stronger.

parts made of high-strength steel.

zinc finish for improved corrosion resistance.

high quality carbon steel with high hardness.

zinc plated surface, anti-corrosion and anti-oxidation, with no burr and flanged anti-slip design, wear-resistant and very practical.

package included: 12pcs m4 jack nuts.