These Triangular Scale Tapes comes in a convenient size, about 4", that can be easily carried in you pocket but yet gives you access to the scales you use most. The ribbon taps are 24" long, lock at any length and are flexible enough to even scale curves. The tapes can be used for takeoffs and other scaling needs in the office or field, you will never go back to a standard 12" Triangular rule. The Engineers tapes come with 10, 20, 30, 40, 50,and 60 scales. The best feature of the architect tape is that it has all 12 scales and reads in ONLY one direction. Each blade edge has only one scale. Since the clover leaf design allows for 3 tapes each with 4 edges, the architect tape is able to have 12 standard architect scales, 1/16, 3/32,1/8, 3/16, 1/4, 3/8, 1/2, 3/4, 1, 1 1/2, 3, 16.