21) A piece of aluminium has to be filed. What type of file cut is most suitable ?

22) The surface of a workpiece with high and low spots has to be equalized by filing. Which filing method you have to use ?

23) Which type of file you would select for filing a wooden plank ?

24) The size of triangular file required for sharpening the tenon saw with 14 points to an inch (25 mm) is :

25) Hacksaw blades are made of