1) Hacksaws are hand cutting tools used for sawing various materials. The blades come in different teeth sizes suited for different material thicknesses, with 18 teeth per inch recommended for general use. 2) Files are another type of hand cutting tool made of high carbon steel with parallel chisel cuts that form teeth. There are different types of file teeth and shapes suited to different materials. 3) Proper techniques for using hacksaws and files include securing the workpiece, applying pressure only on the forward stroke, keeping the tools clean, and using proper body positioning for control and safety.