This jobber drill bit comes with heavy duty grade and standard type. List number is 1500, number of pieces are 1, cobalt steel material, TiN finish, notched point, drill point 130 degree, fractional size 5/16", decimal equivalent 0.3125, flute length is 3-3/16", overall length is 5", shank diameter is 3/8". Ideal for alloy, carbon and tool steel, aluminum, cast iron, high nickel alloy, stainless steel, titanium and hardened steel under 35 HrC.