Just seen the RC Raven screw kit for the T-maxx and E-maxx they are 12.9 and 10.9 strong (what ever that is?) alloy zinc plated blue, 250 of 'em in a box. Anyone got any experience with these?

Want to change all the screws in my Maxx to socket type, I've seen the GA ones but they seem expensive, can anyone recommend any others?