function: 1.remove lens filter :one for locking the lens filter and the other for open 2.lock the lens filter :offer convinence for you to adjust the CPL ND Tips :here are some suggestions in order you can use it easily 1.wrapping waterproof tap 2.wearing gloves to increase friction 3.two people working together 4.clockwise first and then counter-clockwise 5.ropping oil to the filter screw one day before you using it material:plastic color:as the same as the pic weight:0.03(KG) size:10cm |