New hex driver bought from rcb , thought it would fit on my heli hex screws but didnt, as 1.5mm was required so wanted to sell it... never even open a single screw with itt. 

Price  270 + shiping..

For hexdrivers, just go to your nearest hardware store an ask for an 'L allen key'. They know it better by that name. It will cost you some Rs.5-Rs.10 per allen key.

yes bro , you are right, someone from the forum told me to get a 2mm hex driver for the body of 450 v2,    now ordered 1.5 mm and that fits fine..