Duro B11304-NC450 Hex Shank With 450mm Narrow Chisel This Duro B11304-NC450 Hex Shank With Narrow Chisel 450mm O/A Length is suitable for use with the Bosch GSH 27 VC or GSH 16-28 breakers. Narrow chisel hex shanks are used in a similar way to the Moil Points, but the line of fracture can be controlled along the line of the chisel end. This kind of breaker steel should be used in applications where it\'s important to have a clean edge retained on the work piece that is to be broken. SPECIFICATION Length: 450mm O/A Length Shank Type: Narrow Chisel Qty. in Pack: 1 Piece Part No: B11304-NC450