The holder is designed to be tucked into the lens.Precision machined aluminum material resists wind and vibration, with high precision fitting accuracy and robust design.The holder can also be used with different lens apertures by using the adapter set (sold separately).Attach the adapter to the holder, then attach the step up ring.Compatible lens diameters are 3.7 inches (95 mm), 3.4 inches (86 mm), 3.2 inches (82 mm), 3.0This adapter is affordable, lightweight, compact and extremely easy to install. Compatible Filter Size: 7.5 x 6.7 inches (190 x 170 mm), 6.7 x 6.7 inches (170 x 170 mm) *No vignetting