AngularJS the width doesn't corespond

Question

I want to get an element width, but when I inspect the element, it have 71px, but when I debug the value is 69px.

app.directive('minijobsItemPrincipal', function ( ) {
    return {
        restrict: "C",
        controller: function ( $element, $window ) {
            this.getItemWidth = function ( ) {
                $element.css('background-color', 'red');
                console.log ( $element[0].offsetWidth )
            }
        }
    };
});

So, if I use console.log ( $element ), and I search in console the clientWidth value appears 71px, but if I use console.log ( $element[0].clientWidth ), it appears 69px, I can't understand why.