Personalized Mechanic Nuts and Bolts Toddler T-Shirt. Mechanic Nuts and Bolts Toddler T-Shirt - Natural, underlined with a wrench and bedecked in nuts and bolts, are a unique gift design for professional and weekend mechanics! A toddler-soft cotton tee in look-at-me, big kid colors. 4.5 oz., 100% combed ringspun cotton. White is sewn with 100% cotton thread. Topstitched rib crew neck. Double-needle stitched sleeves and bottom hem. Shoulder-to-shoulder taping.