1. Works with LOCKUP profile, it can stand 12 grades (>117km/h) wind to ensure the greenhouse safety
2. Special 65Mn spring steel wire, the spring may be used many times without distortion      
3. The length may reach 2.2m after insert the profile
4. Anti-aged and anti-UV treatment on the surface, resistance to severe high or low temperature
5. Plastic coated to care the film and operator