Full chisel cutter: Square corner cutters (C) for superior cutting efficiency. Recommended for professional chainsaw users in clean conditions. Sharp out of the box: X-CUT chains come carefully sharpened, so you will be ready to cut immediately. The outstanding grinding process provides razor-sharp edges, precise cuts and superior cutting efficiency. Pre-stretched chain: X-CUT chains are pre-stretched, which minimises adjustments and the risk of damaging the cutting system with a slacking saw chain. Golden tie strap for easy filing: A golden-coloured tie strap makes it easy to spot where to start and stop filing the chain. An advanced, full chisel, high-performance 3/8" .050 gauge chain for full-time professional forestry saws. Compatible with the Following: 555, 562 XP, 390 XP