Our UL-NW-S1 lug is our small solid lug, intended for use with our 3/32" pin. The concave base may be soldered to your round barrel. Milled steel, the base is about ..500" long by 0.460" wide. The blade stands .21" above the base. Recommended for the Tulle fusil de chasse and the English fowler. Made in the U.S.A.