The body of a flat chisel is usually made in the shape of

Cape chisel

Cross-cut or cape chisels are used for cutting key ways, grooves and slots.

Grinding

Snagging is a process used to remove the metal by Grinding.

Double cut teeth

Both sides of a flat bastard file have double cut teeth.

Centre of one pin hole to the centre of other pin hole

Length of hacksaw blade is measured from Centre of one pin hole to the centre of other pin hole.