Amazon
Internal square drive according to DIN 3120 / ISO 1174 with notch for 5/16-inch screwdriver sockets with 6.35 mm male drive according to DIN 3126 / ISO 1173: For manual use Satin finish Chrome vanadium, Weight: 0.13 Pounds, Manufacturer: KS Tools
Amazon MarketplaceInternal square drive according to DIN 3120 / ISO 1174 with notch for 5/16-inch screwdriver sockets with 6.35 mm male drive according to DIN 3126 / ISO 1173: For manual use Satin finish Chrome vanadium