Steinmann Pin, Sklar, 3.2mm x 9 in. Steinmann Pin Trocar Point, Stainless Steel. Sklar's Steinmann Pin is a thin metal rod commonly used in orthopedic procedures for holding large bone fractures together. These pins function similarly to K-Wire, but are larger in diameter. This product has a trocar point, 3.2mm diameter, and is 9 inches in length.