Shafts, propellers, couplings and screws are stainless steel. Mounting frames are covered with resilient rubber to virtually eliminate vibration. Propeller blades should be kept 2" from bottom of the container for proper mixing. Shafts can be sized and cut off for your specific container application. Spare shafts and blades are available for both mixers and should be ordered with mixer to assure proper fit. Not for mixing flammables. Super Mixer - Mixes 25 - 100 gallons. Has 28" long 316 SS (for most 55 gallon drums), 2-4" 316 SS propeller blades, 1 push & 1 pull which adjust on shaft and 6-3/4" W x 30" L mounting frame. 1/3 HP motor; 1725 rpm, 110V., 60 Hz., open drip proof.