Chucking reamer with straight, fractional size 5/16", decimal size 0.3125", large end diameter - 0.3125", flute length - 1-1/8", overall length - 3-1/4", number of flutes - 6, chamfer- 45 degree, cutting direction right, material- solid carbide, bright finish, application- ferrous, non-ferrous, metric size- 7.938.