Varisation staples are special pins made of ISO5832-1 stainless steel wire with a diameter of 1 mm and very short length, with a trocar tip at both ends, these pins being bent in a U shape.
All the difficulty of this bending consists in obtaining two parallel legs of the same length, while controlling the springback at the time of cold bending.
AMF also develops varisation staples with machined teeth. In this case, the tip is not made by grinding but by machining. Each tip is then manually sharpened to maintain a Kirschner wire type spiciness.