The old dimmer knob on my son's bedroom light switch broke off. Given his love of Minecraft, I think he likes the new knob much better :)Modeled in Maya. 4 cm square on the front, 2cm deep. The rear hole is a semi-circular shape, roughly .6mm diameter. I had to drill it out slightly to fit the dimmer pole exactly, and put some mighty-putty in there for good measure.