We've run Able Main Rotor Grips, pins,fittings latch bolts and straps for years in our L3's and L4's in an offshore environment with no problems. We fly some of our aircraft more than 1200 hours in 2 years so the 4 year strap, hell the 3 year strap calendar life limit extension does us no good. I buy Able when able. now if you've got a machine that calendars out straps before you flight time them out then get the 4 year straps.