DONT USE THEM!!! I BOUGHT A SET AND EVERYTHING SEEMED GOOD. EVERYTHING WENT TOGETHER WELL AND LOCKED DOWN TIGHT. I'VE BEEN BUILDING "LAMBOS" (FPV RACE DRONES) FOR 9 YEARS NOW SO I WOULD NOTICE IF ANYTHINHG WAS SKETCHY FITMENT WISE.. AND IT FLEW GREAT...SLIGHT IMPROVEMENT IN BOTH HANDLING AND...