Higher productivity without loss of resolution. Agilent J&W High Efficiency GC columns offer a simple and cost effective way to increase your sample throughput with your existing GC or GC/MS instrument. High Efficiency columns also reduce carrier gas usage and cost per analysis. High Efficiency Columns can be applied with existing GC and GC/MS instrumentation. Combined with small column inner diameters (0.18 mm I.D.) for high resolution and short column lengths for high speed, you can achieve higher productivity without loss of resolution.