Pointing tool

A pointing tool, comprising:

• a connecting part;
• a working member;
• and
• a gripping member,
• wherein the connecting part comprises a first connecting part, and the working member comprises a first working member including a plurality of first working surfaces;
• the first connecting part extends from one end of the gripping member, and the first working member is rotatably disposed over the first connecting part, such that it is able to rotate to adjust the position of the first working surfaces;
• wherein the first working surfaces are cylindrical curved surfaces with different radii of curvature, and an angle formed between tangents at endpoints of a corresponding curved line of each first working surface is an acute angle of less than 90 degrees,
• wherein the first working surfaces are connected by first transition surfaces, which are planes, circular cylindrical surfaces having radii of curvature greater than those of the first working surfaces, or circular cylindrical surfaces having negative radii of curvature;
• wherein the connection part further comprises a second connecting part extending from an end of the gripping member opposite to the first connecting part, the working member further comprises a second working member including a plurality of second working surfaces, the second working member is rotatably disposed over the second connecting part, such that is able to rotate to adjust the second working surfaces;
• wherein the second working surfaces are cylindrical curved surfaces with different radii of curvature, and an angle formed between tangents at endpoints of a corresponding curved line of each second working surface is an acute angle of less than 90 degrees,
• wherein the second working surfaces are connected by second transition surfaces, which are planes, circular cylindrical surfaces having radii of curvature greater than those of the second working surfaces, or circular cylindrical surfaces having negative radii of curvature;
• and
• wherein the first working member differs from the second working member in outer surface shape and size, the first connecting part having the same structure as that of the second connecting part.