The threaded interface of the product is metal.
The product square cover is plastic.
Please purchase a suitable square cover according to your lens caliber and filter size.
Note: In order to avoid vignetting, this square mask is not suitable for ultra-wide-angle lenses with focal lengths below 18mm. It is recommended to use lenses with focal lengths above 25mm for better results.
![](https://img.alicdn.com/imgextra/i1/887573444/O1CN01InqCCu1bJOgb1y9Sp_!!887573444.png)
![](https://img.alicdn.com/imgextra/i3/887573444/O1CN01iJ1QrB1bJOgd94BrS_!!887573444.jpg)
![](https://img.alicdn.com/imgextra/i2/887573444/O1CN01n4NGeI1bJOgirsx5C_!!887573444.jpg)
![](https://img.alicdn.com/imgextra/i2/887573444/O1CN01g2lyQy1bJOgfjohm9_!!887573444.jpg)