i would really like to know myself
Wheels are out of balance
balance your tires
What make the steering wheel shake is the tires that need wheel balance.
Loose or worn steering parts, suspension worn, tires out of balance.
Your power steering pump and or steering box may be about to give out on you.
Tire out of balance, bent wheel, drive shaft bent, loose or worn steering parts.
Check tire balance or wheel bearings in front axle
You may need a wheel alignment, or you may need bushings.
Wheel balance may be off...
If it varies with driving speed, look for an out-of-round tire. If it vibrates only when braking, you probably have a warped brake rotor.
lose bolt no seriously its probly your alinement is off
Worn steering or suspension parts. This can be very dangerous, so have this repaired ASAP.