2 speed / variable / reversing. Max core diameter: 132mm. Heavy duty wet diamond core drill with powerful 1,700W motor for shock-free and accurate drilling into concrete and natural stone. Features electronic torque limitation and speed control for a constanr speed even under load. Max Diamond Core Capacity. “1st speed: 132, 2nd speed: 70″ mm. “1st speed: 0-800, 2nd speed: 0-1,570″ rpm. “Adaptor 1¼””UNC Outside ½””BSP inside”. Max diamond core capacity. Some harder-to-reach locations may take an extra day.