Wrapped stem: dia. 1/4" (6 mm), dia. 5/16" (8 mm) and 3/8" (10 mm) 12 pcs each in a box Used for injury repair at angles above 25 degrees For use in radial and bias ply tires. Designed for chemical or heat vulcanization. Wrapped stem: dia. 1/4" (6 mm), dia. 5/16" (8 mm) and 3/8" (10 mm) 12 pcs each in a box