I got a length of this chain given to me by my friend. He referred to it as digger chain. I just need to add three drive links to let it fit my Stihl 20" bars. Looks like it could generate some wicked kickback. The only markings it has are on the drive links--K3. Interestingly, the cutting teeth are on the drive links and not the tie straps. Has anybody here used this chain before?