Trajan Replaceable Luer Lock Needles: Bevel, Length Needle: 51 mm, 2 in., Needle Gauge: 18 G, Needle Point Style: Bevel, Diameter Inner: 0.031 in., 0.8 mm, Diameter Outer: 0.05 in., 1.27 mm, For Use With: Gas chromatography, Stainless Steel, Termination: Luer-lock, Replacement Needle