Description The Athabasca A3 Filter Holder is manufactured from lightweight Aviation grade durable Aluminum Alloy. The design has a built-in thumbwheel that allows the included 82mm Polariser filter to be easily rotated even with square filters installed. It is a complete kit incorporating a filter-holder and range of four adapter rings.     KIT Includes 1 x ARK 100mm Filter Holder (holds two square filters) 1 x Integrated Circular Polarizer filter (CPL)  1 x Ark 67mm Lens Adapter Ring  x  1  1 x Ark 72mm Lens Adapter Ring  x  1  1 x Ark 77mm Lens Adapter Ring  x  1  1 x Ark 82 mm Lens Adapter Ring  x  1 2 x Extra Mounts to allow the mounting of a third square filter 1 x Precision Screw Driver Specifications Aluminium Alloy adaptor rings Aluminium Alloy Filter Holder  Japanese Optical Glass HD Circular Polarizer Filter