1. Extension Bar with Square Drive: 19 mm [ Extension Bar with Square Drive: 19 mm ( 3/ 4 Inch ); SIZE: 200 mm Length; similar to Taparia Product No: 2723 ( reversible ). ] 2. EXTENSION BAR: Square Drive: 12. 7 mm ( [ EXTENSION BAR: Square Drive: 12. 7 mm ( 1/ 2 Inch ); SIZE: 250 mm Length; similar to Taparia Product No: 1763. ] 3. Extension Bar: Square Drive: 19 mm ( 3 [ Extension Bar: Square Drive: 19 mm ( 3/ 4 Inch ); SIZE: 400 mm Length; similar to Taparia Product No: 2763N. ] 4. Extension Bar with Square Drive: 19 mm [ Extension Bar with Square Drive: 19 mm ( 3/ 4 Inch ); SIZE: 300 mm Length; similar to Taparia Product No: 2753N. ]