Stahlwille Series 40ADL Bi-Hexagon, extra deep sockets have 1/4in square drives. They come in AF imperial sizes, and are made from HPQ® high performance steel, with chrome plating. The sockets have an extremely high load capacity with exceptionally thin rings and walls. They are free from cadmium and therefore suitable for use on titanium alloy parts and titanium fasteners, such as those used in the aerospace industry, where safety is crucial. The sockets are equipped with anti-slip drives which permit high transmission of forces to the lands of the nuts and bolts without damaging them. Manufactured to DIN 3124/ISO 2725-1 standards.Overall length: 50mm. MADE IN GERMANY.Stahlwille Extra Deep Bi-Hexagon Socket Socket 1/4in Drive. Size: 1/2 AF.Overall length: 50mm.