Adaptor manually operated 3115/1

for manually operated sockets with recessed 6.3 (1/4") square drive 

DIN 3120/ISO 1174-1 Type C

and D, square drive with ball bearing,

Chrome Alloy Steel. 

outside  Outside Square DIN 3120/ISO 1174-1 Type A (spring-loaded ball)

outside  Outside Hexagon DIN 3126/ISO 1173 Type C