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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Single Piece Prices Based on Shape and Weight. Standard Postcard - a standard postcard mails First Class at current rate of 34Â¢. Standard Sizes - minimum is 3Â½â³ x 5â³ / the maximum size for mailing at the 34Â¢ rate is 4Â¼â³ x 6.â³. Paper Thickness - must be at least 0.007â³ and not more than 0.016â³ in thickness.