Picco and lo pro are the same, the chain on the 017/170 saws is usually Picco micro (semi chisel) mini (narrow kerf) .043. I bought an 017 long time ago, it came with the same chain. 55 is the driver link count. I use it for limbing up to about 6", handy little saw and when used within it's limits will last a long time. I put a 14" Picco micro .050 gauge bar and chain on my 017, it uses the same spur sprocket as the PMM chain. The chain it comes with is good for limbing, but not as fast as limbing with an MS261CM!