5/8" Shank Diameter, Straight Shank, 13/16" Counterbore, Carbide Tipped, 3, (. Product Details 13/16" Counterbore, Carbide Tipped, 3 Flutes, 5/8" Shank Diameter, Straight Shank, 5 3/8" OAL, USA Made, (.8125" Diameter), 59810 For Counterboring most materials Tool diameter tolerance: +.001"/-0". Shank Diameter Tolerance: +0"/-.0005" Pilot Hole Diameter:1/4, If using a pilot this is the shank diameter of the pilot you should choose Minimum Cut Diameter: .29" Because there is a pilot hole the tool will not cut below this diameter. Set screw to hold a pilot or drill bit in place (if you are using a pilot or drill bit) Payment We accept PayPal and credit cards via PayPal. Taxes - US We collect sales tax, as required by law. Shipping We make every effort of shipping within 3 business day of payment clearing. The estimated delivery time is 2 - 5 business days from the shipping date. Policies If you do need to return your item, please contact us via email (you will receive an email when your product ships with additional details - Subject: Important information about your purchase). You will then be provided with a return shipping label and packing slip. Pack the item carefully. Include the packing slip, apply the shipping label, and return the item within 30 business days of the date you request a return, or your return will be canceled. Once we receive your order we will inspect the return. Please allow up to 5 business days of receiving the returned item for your refund.