HUITONG FAN GUARD HAVE THE SIZES BELOW:
a)25*25mm   b)30 *30mm  c) 40*40mm     d) 50 *50 mm     e)60 *60mm  
f)70*70mm    g)80* 80mm    h)90*90mm    i)110*110mm     j)120*120mm

The material of FAN GUARD is iron.