Made of aluminum, anodized black ,Flat,
So it is stronger for your expensive and heavy lens.
Thickness:4mm
There are 3 sizes for your choice,fit more need.
#0(inner Dia.34.6mm)
#1(inner Dia.41.6mm)
#2(inner Dia.52mm)
#3(inner Dia.65mm)
Un-drilled,you can DIY
weighing about 151g.
If you need to customize the hole size, please contact us！