The 52mm lens filter adapter ring for GoPro Hero 3+  is made by CNC, It also allows you to mount ND, UV lens, gradient filter lens, polarizing lens of diameter 52mm on to the HD video camera case. 

1) Brand new and high quality 

2) Material: Aluminum Alloy 

3) CNC Machined Made 

4) Anodized Black

5) Weight:14

6) For Filter Size: 52mm