Rail driller: 1, motor power: 1.0 kW 2, rated voltage: 220 v 3, no- ... type drilling operation. The whole structure is compact, rail clamping device with self-locking function, accurate positioning, drilling high precision. The hollow bit ... overhaul operations necessary tools.Second, the main technical parameters1, motor power: 1.0 kW2, rated voltage: 220 v3, no-load speed ...