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 in Stem 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)