Single hole tubing edm brass tube electrode single channel for small hole drilling edm We are specialized in 4 main categories of edm tubing: brass electrodes tube, copper electrodes tube, single hole tubing, multi-channel tubing. This edm electrode tube is the single hole brass tube for small hole popping drilling edm. Edm brass tube features: Outer diameter: 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm ……2.9mm, 3.0mm Material: brass Composition: cu: 63.5%~68.0%, zinc: 32%~36%, others Impurities: