A double-sided eyelet, of having a first head (2) provided with an element (3) having a shank (4) and a second head (8) provided with an element (9) having a shank (10), wherein the aforesaid heads (2,8) are mutually closed on the hole (6) of a support (7,17). According to the invention, the second head (8) of the eyelet is provided with a seat (14) suitable to receive the folded edge (16,18) of the shank (4), in which the size of the aforesaid folded edge is variable as a function of the thickness of the support (7,17). In comparison with known eyelets for leatherwear and for clothing in general, the eyelet according to the invention offers the advantage that, while preventing the formation of unsightly excess thicknesses on the coupling section of the shank of the first head inside the hole of the second head of the eyelet.