Portable Electric Small Drill Pump Self-priming Hand Drill Powered Water Pump Commodity Parameters: Weight: 400g (0.88 Lb) Size: 12.5cm * 10.77cm (4.92 * 4.24 Inches) Upper and Lower Diameter: 7.86cm (3.09in) Left and Right Outer Diameter: 2.1cm (0.83 in) Inner Diameter: 1.58cm (0.62 in) Please Refer to the Dimension Drawing for the Specific Size Purpose: Pump Water in Any Environment (Note: Do Not Use Strong Acid or Alkali, Gasoline or High Temperature) Material: Engineering Plastics Driving Mode: Electric Principle: Centrifugal Pump .