These 1010 rail button standoffs were created to be used with 1010 standard rail buttons I have designed or your own and will conform to 75mm/3.0in. airframe rocketry tubing.
They are designed to be more aerodynamic by conforming to the rocket airframe tube that will standoff rail buttons to the following heights - 4.76mm (0.1875 in.), 6.35mm (0.250 in.), 9.53mm (0.375 in.), 12.7mm (0.500 in.).
You can find the 1010 standard rail buttons below.
1010 Standard Rail Button
1010 Standard Rail Button Rounded