505BT - Power Battery Top Post Cleaner with Composite Hex Stem - Use with Power Drill

Power Battery Top Post Cleaner with Composite Hex Stem - Use with Power Drill   - 5/16 inch Composite Hex Stem- Use on SAE Top Post Terminals- Works on both positive and negative terminal posts- Brush wires have a 70° bend- Clean up to 50 posts per minute- Maximum speed 400 to 800 RPM   Note: Cleans up to 1000 battery posts in one direction. After the effectiveness diminishes, extend the life of this cleaner by reversing the drill direction. Specifications Stem Size: 0.31 in (7.87 mm) 5/16 inStem Length: 1.18 in (29.97 mm)Max Post Diameter: 0.71 in (18.0 mm)Max Post Length: 0.625 in (15.9 mm)Length: 2.64 in (67.1 mm)Width:  1.83 in (46.5 mm)Height: 1.83 in (46.5 mm)Weight (lbs): 0.11 (50 g)