portable drill machine: 1.the biggest drilling diameter: 32 2.PATENT ... Products include rail cutter, rail grinder, rail drilling machine, track lifting and lining machine, railway ballast tamper, railway bolt wrench, rail bender , rail gap adjuster, ... high reputation. SZG-32 type portable drill machineFeatures:SZG - 32 type hand rail drilling machine is suitable for railway electricity, maintenance, ...