NiSi Brass Pro 67mm to 72mm Step Up Ring, Converts 67 Lens to 72 Filter 67 72mm industrial_DE_Aug2026 Safety protection: the PWM controller B00IIC6ALK Safety protection: the PWM controller is equipped with a fuse for self recovery Hand sharpening is more economical and gentle than machine sharpening to achieve the best results when hand sharpening your saw chain IDEAL FOR MULTIPLE LENSES: Simplify your setup by using this filter adapter ring to stack filters and lenses STEP UP RINGS FOR FILTERS: This 67mm to 72mm step up ring features a male 67mm thread at the back to securely attach to your lens and a female 72mm thread in front to support a wide range of 72mm filters and accessories