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C-6612 Short Angle Clamp : Clamping 12mm diameter Tube. Like12mm Tube, H8-12-05~30, H9-12-05~3..
C-66M12 Short Angle Clamp : Clamping M12x1.0 TubeFor example clamping M12x1.0 Tube, H2-12-05~30, H89..