Font size of a spinbox

[SailinShoes]

I define the font size for all views/widgets in main. But I would like to set a different font size to a spinbox in one of the views. I do this explicitly like this

pSpinbox = new QSpinBox(this);
QFont font( pSpinbox->font() );
font.setPointSize( 48 );
pSpinbox->setFont( font );

pSpinbox = new QSpinBox(this);
QFont font( pSpinbox->font() );
font.setPointSize( 48 );
pSpinbox->setFont( font );

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But the font size of the spinbox remains the same? What is wrong?