Tubular pin tumbler lock - Design. 1  The design of a tubular lock is similar to the pin tumbler lock, in that there are several stacks of pins. The key is a cylinder shape with notches cut around the outer or (rarely) inner edge. Each of these notches depresses a single pin inside the lock to a specific height allowing the lock cylinder to turn freely.
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Current Postage Rates; USPS Postage Rates. USPS Â® Rates are determined based on a combination of weight, mail class, and shape. For certain services, discounted pricing is available for customers who purchase from online PC Postage services such as Stamps.com. Below is a summary of the latest USPS prices: