More durable, fix to tank in a strong way 
Suitable for tank dia of:
5in(TANK DIA: 105~127mm)
6in(TANK DIA:130~152mm)
7in(TANK DIA:156~178mm)
7.5in(TANK DIA: 140~190mm)
8in(TANK DIA:179~203mm)
8.5in(TANK DIA:155~216mm)
Customization are welcome.