Optional two piece* construction made to bolt into the 2012-2015 Procross applications. Some clutch tuners like having lots of tuning options. For those that tune with multiple helixes, this may be a more cost-effective option. The user can purchase one cover and can use it with multiple APT helixes. Once a 472-DHC200 cover is bolted on, this assembly is the same as a one-piece helix and you use the same factory plastic spring washers as a stock or Dalton ‘‘AP’’ model helix. Solid billet construction and the quality you expect from Dalton.