Answer:
I help engines spin and pants stay up.
I stand up tall and am made of steel With baguettes and garlic at my heel. I love the colors red white and blue but obviously not as much as you. I am a marvel for all to see Though to some I am a monstrosity!
What has a ring but no finger?
I go through a door but never go in and never come out.
I beam I shine I sparkle white. I’ll brighten the day with a single light. I’ll charm and enchant all I’ll bring the best in you all.
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.