Detailed Product Description

Features:

1) Outside is zinc-plated steel planks; high performance and rustproof
2) Thickness: 40/50mm
3) Door is steel/polyurethane/steel construction
4) Heat insulating coefficient: R=20.15
5) The U-tube rubber at the bottom along with the top and side seals are
tight, keeping out wind, dirt and water
6) All the metal tightening parts are made of galvalized steel
7) Torsion spring can be used for more than 100,000 times
8) Glass window is made from toughened glass
9) It has a quick stop system when meeting obstacles