seg = 360;
seg2 = 60;
outer = 12;
height = 5;
rad = 1;
dist = 1.5;

rotate_extrude($fn = seg)
difference()
{
	square([outer, height]);
	translate([0, 1.5, 0])
	{
		square([10.5, height]);
	}

	translate([12, height/2 + dist, 0])
	{
		circle(rad, $fn = seg);
	}

	translate([12, height/2 - dist, 0])
	{
		circle(rad, $fn = seg);
	}
}