AccusizeTools - 7 Pcs Inch Premium HSS 6542 Solid Capscrew Counterbore Set 3 Flute Straight Shank, 509S-0007 Inch Sizes: 6#, 8#,10#, 1/4&#039;&#039;, 5/16&#039;&#039;, 3/8&#039;&#039;, 1/2&#039;&#039; H.S.S. Straight Shank Bright Finished Premium Quality Packed in Solid Strong Wooden Box