Keo 55220 Cobalt Steel Precision 3 Flutes Cap Screw Counterbore,, 5/16" Size Product Details Precision 3-flute cap screw Kounterbore. Integral pilot, straight shank, CNC precision ground. Cobalt HSS. Micro-smooth CNC precision ground for precision smooth counterboring. M35 Cobalt: HSS, 6 percent Tungsten, 5 percent Moly, 5 percent Cobalt - long tool life in all types of materials. High performance cutting action due to secondary relief behind cutting edge margin. Optimized helix for chip evacuation - chips flow away from cut without wrapping around tool. +1/32 O/S application. Assembly criteria - 1/32" Clearance. Cobalt steel tools are similar to high-speed steel, but with more cobalt for improved performance when cutting harder metals such as stainless steel or nickel alloys. Uncoated tools feature just the base substrate without any additional treatment or coatings and are suitable for a wide range of applications. Round shanks allow use with a wide variety of toolholding systems. When run in a counterclockwise direction (right-hand cut) spiral fluted tools evacuate chips up and out of the cut to reduce clogging. 3 flutes. Cobalt steel tools are similar to high-speed steel, but with more cobalt for improved performance when cutting harder metals such as stainless steel or nickel alloys Uncoated tools feature just the base substrate without any additional treatment or coatings and are suitable for a wide range of applications Round shanks allow use with a wide variety of toolholding systems When run in a counterclockwise direction (right-hand cut) spiral fluted tools evacuate chips up and out of the cut to reduce clogging 3 flutes 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.