1. Aluminum alloy padlock, with functions of child-lock and preventive falling for 

  lock points, oxidation treatment process.

2. #624/#625 single wheel settings,high toughness plastic material,with super 

   precision ball bearings inside, if used with stainless steel racks, slide more smoothly.

3.The lock rod and lock points can be adjustable and high toughness plastic 

  drive bar with lock rod, more quiet in use.