Sure-Grip Ex Combustibles Safety Cabinet For Paint, 60 Gal, 2 M/C DrJustrite Sure Grip Ex Combustible Safety Cabinet for Paint and Ink 60 gal. Manual Close Doors Easily separate and identify Class III combustibles using these red safety cabinets. Adjustable shelves accommodate many smaller paint tins, aerosols, and inks found in printing, painting, furniture, and motor vehicle operations. Sure Grip EX combustibles storage cabinets have all the same quality features as Justrite's flammable cabinets as outlined below.