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In this instructable I will show you how to use a quick release.

Step 1: Materials

-metal shackle
-string/rope depending on how much weight you have on it.
-chain
-scissors 

Step 2: Shackle

Tie the string/rope around the thing you want to drop. Then take the pin out of the shackle. Put the string, tied to whatever you are using, and the chain in the shackle. Now put the pin on but be sure not to screw it in.

Step 3:

Tie the string onto the pin of the shackle. Make sure that the chain is on the pin and the string/rope is attached to the shackle. 

Step 4:

Now get a distance away from your rig while still holding the string and tug! The pin should fall out of the shackle and drop the tape roll (in my case) on to the ground! 
instead of doing this, use a snap shackle, that's what they're for
never used one of these like this( quick release). Should work well but I wouldn't use it with much weight attached for fear of breaking the shackle (weight rating will decrease a lot without screwing shackle together) and damaging the threads with repeated pulling through chain. These aside, lighter duty use should be great.
I thought of it being used for littler stuff.
Overkill
wow
PS. Quick release shackles are also called snap shackles.
Here is where i bought my metal shackle/quick release! http://www.homedepot.com/webapp/catalog/servlet/Search?storeId=10051&langId=-1&catalogId=10053&keyword=metal+shackle&Ns=None&Ntpr=1&Ntpc=1&selectedCatgry=Search+All

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