A stapling tool for hardwood flooring staples and hardwood tongue and groove flooring planks is disclosed. The tool has a body that includes a body base surface, a stop surface, a body top surface and a staple slot. The tool has a rod assembly that includes a hammering head and a staple driving head. A hardwood flooring staple, inserted into the staple slot, followed by the staple driving head, is guided by the staple slot. In response to impact force received by the hammering head from a head of a hammer, the staple driving head drives the hardwood flooring staple into an external angle formed by the tongue and the outside edge of the plank. The staple may be inserted from beyond a plane defined by the body top surface. The staple slot may be at an angle greater than 45 degrees, less than or equal to 85 degrees.