INJORA 4 PCs RC Hex Nut Screw Driver Set, 4.0mm 5.5mm 7.0mm 8.0mm Hexagon Head Nut Screwdriver Wrenches, Socket Driver, RC Car Repair Tool Kit for RC Model Car Boat Helicopter :
Homemade split nut driver - Make:
4pcs Hex Nut Drivers Screw driver Tools Kit Set for RC Helicopter RC Boat Rc Cars, Metal 4.0/5.5/7.0/8.0mm NUT Key Socket Screwdrivers : Amazon.co.uk: DIY & Tools
Screwdriver/Nut Driver 8-in-1 HVAC Multi Tool Klein Tools 32596 : Amazon.co.uk: DIY & Tools
Klein Tools 80045 Screwdriver and Nut Driver Tool Kit, Includes Magnetic 11 in 1, Multi-Bit Stubby and Electronics Screwdrivers, 3-Piece : Amazon.co.uk: DIY & Tools
Klein Tools 32500HD Multi-Bit Screwdriver/Nut Driver, Impact Rated 11-in-1 Tool with Phillips, Slotted, Square and Torx Tips : Amazon.co.uk: DIY & Tools