hi phillip, i run the ronstan 46101, auto. on my stingray with 21 sq.m. kite. and my crew swears by them. really good grip, very lttle pressure even in 20 knots they grip really well. never a problem thru gybes. my crew sam has the same on his elliot 7.8 sportsboat, mind you he runs the 57mm size but he also has a 56 sq.m kite!!! if you can get them cheap they definately the best to go for.