These are not safety chains. These are full Chisel cutters made from OCS-01 steel provides greater durability especially in cold cutting conditions. The top of the tooth have the file marks stamped on them- no more guessing at the angle.
These chains fit most of the big 20 inch Stihls, Dolmars and Husqvarna. These chains are 3/8 pitch. 050 gauge and 72 drive links. If you have a 72, 80, or A1 stamped on your drive link and there is 72 drive links these will fit your saw. These also cross with Stihl 33RSC and 33RS 72 chain. Send me a question if you are unsure what your saw uses. The item "10 72LGX072G Oregon 20 full chisel chainsaw chains 3/8 pitch.050 gauge 72 DL" is in sale since Wednesday, October 28, 2015. This item is in the category "Home & Garden\Yard, Garden & Outdoor Living\Outdoor Power Equipment\Chainsaw Parts & Accs". The seller is "frawleyssawshop" and is located in New Albin, Iowa.
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