1.A Cage Nut consists of a square nut in a spring steel cage which wraps around the nut. The cage has two wings that, when compressed, allow the cage to be inserted into the square holes in equipment racks. When the wings are released they hold the nut in position behind the hole. This makes cage nuts easily replaceable. 2.Made of good quality carbon steel material, zinc plated finish, corrosion-resistant. Material: Carbon Steel Finish: Yellow Zinc Plated Thread Size: M10 Suitable for plate hole size (hook distance): 10-10.5mm Overall Size: 17 x 16 x 12.5mm / 0.67" x 0.63" x 0.49" (L*W*H) Package Content: 10 Pcs x Cage Nuts