Here is 2 brand new 20 inch oregon chains. 20LPX078G. List $30.13 each.These are high-performance chains for professional woodcutters that use .325 pitch saws. These have blued cutters for improved strength. Faster Cutting than before-New X grind on teeth for faster speed even when boring and undercutting. Square-corner chisel cutters.These are the professional version of H78 packaged chains.These chains fit most of the 20 inch echo such as cs-4000 4500 4600 5000 510 5500. Poulan 255 295 2500 2600 2750 2775 2900 3050 2700 2800 3000 3300 3350 3450 3700. Dolmar models ps-460 Husqvarna 50 51 55 39 44 340 444 and others. These chains are .325 pitch .050 gauge and 78 drive links. If you have a k1 or 33 or 20 stamped on your drive link and there is 78 drive links like photo these will fit your saw. Send me a question if you are unsure what your saw uses. We have other chains and sizes and can list them on our ebay store. Payment due in 7 days. You can check to see if these fit your saw on oregonchain/prolookups. We ship USPS priority.