The Eclipse BHX9/64X3-1/2 (9SD-0274-BH409) 9/64 in. Ball Hex Bit (3-1/2 in. Long, 1/4 in. Hex Drive) is a high-quality bit durable enough for sturdier operation. This bit is constructed out of S-2 tool steel that boasts a hardness level of HRC 59 - 61.
