Personalized Mechanic Nuts and Bolts Women's Plus Size T-Shirt. Mechanic Nuts and Bolts Women's Plus Size T-Shirt - Heather, underlined with a wrench and bedecked in nuts and bolts, are a unique gift design for professional and weekend mechanics! 100% combed ringspun cotton premium jersey (CVC Colors are 60/40 combed ringspun cotton/polyester)