portable drill machine: 1.the biggest drilling diameter: 32 2.PATENT 3.CRCC ... .. Products include rail cutter, rail grinder, rail drilling machine, track lifting and lining machine, railway ballast tamper, railway bolt wrench, rail bender ... very high reputation. SZG-32 type portable drill machineFeatures:SZG - 32 type hand rail drilling machine is suitable for railway electricity, maintenance ...