You know you're a gearhead. (Would you be on this web site if you weren't?) How can you NOT have this clock somewhere in your home, office, or garage? That is, why have a plain old regular clock, which all it does is tell time, when you can have a clock that looks like a real brake rotor and caliper? And we don't mean it looks sort of like a brake rotor. This thing looks EXACTLY like a real brake rotor, down to the machining marks and cross-drill holes on the real metal surface. Amazing! (It's also nice that it doesn't weigh 25 pounds.)
Oh, and it also tells time.
15" diameter. Requires an AA battery, which is not included.