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Size Designations and Band Numbers

Aluminum Bands (Butt-end, Lock-on, and Rivet)

There are 22 sizes of bands (not including hummingbird bands) currently used in North American banding. Their approximate inside diameter and height is as follows:    

BAND
SIZE

INTERNAL
DIAMETER

HEIGHT OF
BAND

BAND TYPES*

Hummingbird

1.27-1.52 mm

1.6 mm

B

0A

1.98 mm

5.5 mm

B

0

2.11 mm

5.5 mm

B

1

2.39 mm

5.5 mm

B

1B

2.77 mm

5.5 mm

B

1P**

2.84 mm

5.5 mm

B

1A

3.18 mm

5.5 mm

B

1D

3.50 mm

5.0 mm

B

2

3.96 mm

6.7 mm

B

3

4.78 mm

6.7 mm

B

3B

5.16 mm

6.7 mm

B

3A

5.56 mm

6.7 mm

B

4

6.35 mm

9.5 mm

B, L

4 Short

6.35 mm

7.0 mm

B

4A

7.14 mm

9.5 mm

B, L

4A Short

7.14 mm

7.0 mm

B

5

7.95 mm

9.5 mm

B, L

5A

8.74 mm

9.5 mm

B

6

9.53 mm

9.5 mm

B, L

7A

11.13 mm

14.0 mm

B, L

7A Short

11.13 mm

9.5 mm

B

7

12.70 mm

12.7 mm

B

7B

13.49 mm

12.7 mm

B, L

7B Short

13.49 mm

9.5 mm

B

7D***

15.0 mm

12.7 mm

L

8

17.48 mm

15.8 mm

B, L

8A

20.65 mm

15.8 mm

B, R

9

22.23 mm

15.8 mm

B, L, R

9A****

25.39 mm

15.8 mm

R

9C

28.58 mm

28.5 mm

B, R

* B - Butt-end bands available; L - Lock-on bands available; R - Rivet bands available
** Snowy Plover ONLY; no other species to be banded with this size.
*** Lock-on ONLY; no butt-end bands available.
**** Available Mid March 2013