The MR Series are manual release chuck controls designed for use on 110 VDC chucks up to 300 watts. Features include: 3 position control switch (On-Off release), lighted AC power switch, optional variable power, heavy gage splash resistant enclosure, 43A" wide x 8" high x 5" deep with 6' AC input cord and 3' DC output cord. Input voltage: 120 VAC, 50/60 Hz. Center distances of mounting holes are 3" x 8".