... SDL 216B,GMC- SDL214,GMC- SDL212,GMC- SDL 210 single drum vibratory rollers effect powerful centrifugal force and great static linear ... , and 16-20 ton road roller.Main Features of Single Drum Vibratory Rollers 1. Mechanical travel drive, double amplitude, hydraulic ... operation and maintenance. 3. Two sets of brake devices, a hand brake and foot pedal brake, assure the machine's safety and dependability ...