a set of 4 Motor Mounts for 25mm Tubes.
for each motor mount you need 4 screws with m2 x 12mm and also a square bolt with 5mm sides.
these mounts are available with large, normal, small and no feet.. you are looking at the version with NO FEET
the mounts include 2 sets of bars that should be superglued onto the tubes where you put the motormount on.
with these bars you can be sure the motor points upwards and wont be able to turn off being vertical.
i allready was flying with these mounts a LOT on my different quadcopters.
they went through many versions and adjustments until i got them as far as they are now.