Personalized Mechanic Nuts and Bolts Toddler Dress. Mechanic Nuts and Bolts Toddler Dress - Red with Polka Dots, with "mechanic" underlined with a wrench and bedecked in nuts and bolts, are a unique gift design for professional and weekend mechanics! Your little one will be adorable and comfortable in this 100% combed ringspun cotton 1x1 baby rib dress!