Kushlan Products KPRO Unassembled Mixer 3.5 cu. ft., 5/16 in. Gauge, polyethylene drum, 22 in. drum diameter, 17 in. drum opening 1/2 HP electric 120-Volt motor 21 drum rotations per minute, belt driven Steel tubing frame with retractable handles for easy transport and storage Pneumatic, heavy rubber, flat resistant tires