PolarPro Helix MagLock Burkard Series ND1000 ND + Circular Polarizer Filter

Revolutionary MagLock system combines magnets and a quarter-turn lock for unparalleled security. No vignetting down to 17mm with a single filter (16mm on Canon/Nikon) and 19mm with dual stacked filters. Rubber frame insert offers enhanced grip over aluminum frames. Precision-engineered brass filter frames and thread bases. Comes complete with front and back Defender caps for unmatched protection during transit and storage.