Stahlwille 01410012 40a 3/16 Socket Anti-Slip-drive High-Performance-Quality Metric sizes: DIN 3124/ISO 2725-1, ASME B 107.5M, E DIN EN 3709 (test loads), American sizes: ASME B 107.1, Fed. Spec. GGG-W-641, SAE AS 954-E (test loads), HPQ® high performance steel, chrome plated. Features: Spanner Open