Sherwood: 1/2"X16 BSF HSS Hexagon Die Nut BS 1127. For use with spanners to clean and repair existing external screw threads. MPN: 5036140282261 EAN: 5036140282261 1/2"X16 BSF HSS Hexagon Die Nut Attributes: Dimensions Standard: BS 1127 Hex Width: 1.1in Material: High Speed Steel Thickness: 1/2in Thread Direction: Right Hand Thread Size: 1/24in. x 16 Thread Standard: BSF