From Amazon
Proxxon Impact 23970 Socket Spanner Set Extra Long for Use with Pneumatic Screwdrivers Extreme Wear Resistance 1/2 Inch Length 130 mm Diameter 17/19/21 mm Torque: 500 Nm
Conrad Electronic
Proxxon Industrial Kraft bit set 1/2 (12.5 mm) 3-piece 23 970