The Vintage Belzer-Liliput no. 1931 Spanner is a rare find from the 50's-70's era, boasting a 7/16" size that fits a 1/4" BSF nut. Made in Germany by the reputable brand Belzer, this offset open spanner is a single item piece. A collector's item for garage enthusiasts, this SAE system of measurement tool is a unique addition to any vintage tool collection.