. Author manuscript; available in PMC: 2012 Apr 30.

Published in final edited form as: J Neurosci Methods. 2011 Feb 24;197(2):209–215. doi: 10.1016/j.jneumeth.2011.02.015

Table 1.

Hamilton™ Syringe Needle Gauge Index^a

Gauge	Nominal O.D.^* (mm)	Nominal LD.⁺ (mm)	Wall Thickness (mm)
33	0.21	0.011	0.05
29	0.34	0.18	0.63
27	0.41	0.21	0.1
24	0.57	0.31	0.13

O.D. = outer diameter

⁺

I.D. = inner diameter