Sturdy shape especially for use with electric or compressed air impact wrenches. With cross hole and snap ring groove for securing sockets. Internal square to DIN 3121. For safety reasons must always be secured using a suitable locking pin and O-ring. External square to DIN 3121 E 10 with spring pin, internal square to DIN 3121 G 10 with hole and snap ring groove.
Chrome molybdenum steel, surface burnished.
Further sizes and types on request.
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