Duro Diamond Core Drill MotorA powerful, feature packed drill motor for use with wet and dry core drills. For dry drilling please select the AD3 DRY adaptor to enable the use of a dry core drill. 1. 7KW power means the DD 150 can be used with cores up to 162mm diameter. The core drill will perform more effectively faster and with less binding. DD 150 can be used effectively with the full range of diameters from 12mm to 162mm. Highest RPM setting is 4270rpm. The 60mm collar means