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More about keys and how to make one if y... > Five pounds of my favorite keys - Pg. 98

More about keys and how to make one if you don't have one 77 demonstration. I'm going to spend the next little while talking about keys. For the sake of time, I'll narrow that down to discuss keys for pin tumbler locks. Since these are the most common locks that we see in our homes and offices, they are also the most likely to be attacked or tampered with by the bad guys of the world. For this next discussion, I'm going to assume that you know a little bit about the keys in your pocket. The notches in the key of varying depths are called bittings (some of us old guys still call them cuts). These need to be very accurate down to a couple thousandths of an inch in order for the pins in the lock to reach the shear line when the key is inserted, thus allowing the plug to turn. Those bittings each appear to be at a random depth. They aren't. Each lock manufacturer has a series of specific depths for the bittings on the keys for their locks, and there are normally between six and nine different depths of bittings for each keyway from that manufacturer. Five pounds of my favorite keys Here's an eBay find that has been one of my favorites over the years. Figure 3.16 is a picture of 5 pounds of pin tumbler keys that I spotted one afternoon for sale on eBay. To the untrained eye, it would appear to be a box of random keys from many