Built to hold up to the demands of the professional user, the innovative STIHL HEXA™ Saw Chain provides fast cuts and long-lasting edge retention. The first of its kind on the market, the patented HEXA™ Saw Chain features a V-shaped cutting edge and provides 10% faster cuts when compared with the STIHL RAPID™ Super saw chain. The HEXA™ System also features a unique hexagon-shaped file for fast and easy hand filing. With three saw chain options (RH, RH3 and RHF) and two groove widths (0.050" and 0.063"), the high-performance HEXA™ Saw Chain will keep up with the pros for the long haul. RH = Rapid Hexa (yellow) RH3 = Single Humped drive link (green) RHF = Full Skip (yellow)