portable drill machine: 1.the biggest drilling diameter: 32 2.PATENT 3.CRCC Detailed product's describe:1. ... .. Products include rail cutter, rail grinder, rail drilling machine, track lifting and lining machine, railway ballast tamper, railway bolt wrench, rail bender ... technical parameters:1, the biggest drilling diameter: φ 322, the profile size: LWH 650 x 75 x 10003, the machine quality: 8 kg