40 Pin Male Header is 2.54mm (0.1″) 40-pin break away single row male header. It can be cut to size with a pair of wire-cutters. You can use them for many projects; for example with the Arduino shields. Specifications: Contact spacing: 2.54mm (0.1″) Number of positions: 40 Number of rows: 1 Gender: male Termination type: straight Mounting style: through hole Specifications: Contact spacing: 2.54mm (0.1″) Number of positions: 40 Number of rows: 1 Gender: male Termination type: straight Mounting style: through hole Specifications: Contact spacing: 2.54mm (0.1″) Number of positions: 40 Number of rows: 1 Gender: male Termination type: straight Mounting style: through hole Specifications: Contact spacing: 2.54mm (0.1″) Number of positions: 40 Number of rows: 1 Gender: male Termination type: straight Mounting style: through hole Specifications: Contact spacing: 2.54mm (0.1″) Number of positions: 40 Number of rows: 1 Gender: male Termination type: straight Mounting style: through hole Specifications: Contact spacing: 2.54mm (0.1″) Number of positions: 40 Number of rows: 1 Gender: male Termination type: straight Mounting style: through hole Specifications: Contact spacing: 2.54mm (0.1″) Number of positions: 40 Number of rows: 1 Gender: male Termination type: straight Mounting style: through hole Specifications: Contact spacing: 2.54mm (0.1″) Number of positions: 40 Number of rows: 1 Gender: male Termination type: straight Mounting style: through hole Specifications: Contact spacing: 2.54mm (0.1″) Number of positions: 40 Number of rows: 1 Gender: male Termination type: straight Mounting style: through hole Specifications: Contact spacing: 2.54mm (0.1″) Number of positions: 40 Number of rows: 1 Gender: male Termination type: straight Mounting style: through hole Specifications: Contact spacing: 2.54mm (0.1″) Number of positions: 40 Number of rows: 1 Gender: male Termination type: straight Mounting style: through hole Specifications: Contact spacing: 2.54mm (0.1″) Number of positions: 40 Number of rows: 1 Gender: male Termination type: straight Mounting style: through hole