Selens Professional Aircraft Aluminum Versatile Square Metal Modular Filter Holder Fit for 67-86mm 72-86mm 77-86mm 82-86mm Step-Up Ring Adapter Quick installation and removal, with the insurance button to prevent falling The black matte oxidation surface is function to Anti-reflective. All screws are made of copper and plating. Fit of Width 100mm, thickness 2mm square filters to use. Compatible with 67-86mm 72-86mm 77-86mm 82-86mm step-up ring adapter or other accessories. Made of high quality anodized aluminum and polished with strict surface treatment to avoid wobbling or cross-threading, combined with a slim design makes this ring durable and functional. Note: Make sure you order the correct size otherwise it will not fit your lens. ( Your lens thread size will be printed underneath your lens cap or written somewhere on the lens barrel )