Two-way nut spanner

A two-way nut spanner comprising:

• a handle;
• and
• an engaging head formed on an end of the handle and having
• a central axis;
• a base surrounding the central axis of the engaging head to form a C-shape and having a first abutting surface and a second abutting surface respectively located at two opposite sides of the base;
• a first engaging portion protruding from the first abutting surface of the base and having
• a first surrounding portion being C-shaped, protruding from the first abutting surface of the base, and having a first opening;
• and
• multiple first engaging blocks protruding from an inner surface of the first surrounding portion, and arranged around the central axis of the engaging head at angular intervals, each of the first engaging blocks having a first inclined surface located away from the first surrounding portion and extending obliquely from the first abutting surface of the base toward the first surrounding portion and away from the first abutting surface of the base;
• and
• a second engaging portion protruding from the second abutting surface of the base and having
• a second surrounding portion being C-shaped, protruding from the second abutting surface, and having a second opening;
• and
• a second engaging block protruding from an inner surface of the second surrounding portion, located near one of two edges of the second opening, and having a second inclined surface located away from the second surrounding portion and extending obliquely from the second abutting surface toward the second surrounding portion and away from the base;
• wherein a width of the second opening of the second surrounding portion is larger than a width of the first opening of the first surrounding portion.