I designed this to be a replacement for the official E3D Titan bracket that makes it easier to mount to a 2020 aluminum extrusion. I'm using it on my Hypercube but it should work on any printer using 2020 extrusions. The holes are 5.2mm wide for M5 screws. There's also a cutout for the cable connector on the motor. I'm using a 40mm motor so the cutout won't work if you're using a pancake motor, but you can still rotate the motor to make it fit.