Cannula, Stainless Steel, 16 Gauge X 24" Length, Airfree, Schlenk. For the transfer and handling of air sensitive materials. Constructed of Stainless Steel #304 with both ends having a 22¿ deflected point for septum penetration. Available in the listed needle gauge and lengths. SOLD 3/PKG.Needle Gauge Dimensions:16 Gauge: 0.065" OD x 0.047" ID18 Gauge: 0.049" OD x 0.033" ID20 Gauge: 0.035" OD x 0.023" ID22 Gauge: 0.028" OD x 0.016" ID