Uxcell Tap Bit Sets, 5/16-18 Unc H2 Straight Flute Machine Thread Milling Tap Product Details Straight Flute Tap: Twist Drill Bit: Descriptions: Straight flute design, downward chip removal, fast tapping with accuracy. Suitable for processing through holes or shallow holes. For tapping aluminum, die steel, stainless steel, bronze, hard plastics. High-speed steel tool has high hardness and toughness for wear resistance. Features just the base substrate without any additional coatings, good for wide ranges of applications. Used on drilling machines, tapping machines, CNC and milling machines. Use with tapping oil to get higher quality threads and more durable taps. Machine taps are suggested to be used with tap collets with overload protection. Hand use is easy to cause breakage to the tap due to uneven force. Tap Bit Sets: Tap size: thread size: 5/16-18 UNC; accuracy: H2; total length: 100mm / 3.94". Drill bit size: cutting edge diameter: 6.5mm / 0.256"; total length: 148mm / 5.83". Thread Tap: Straight flute design, downward chip removal, fast tapping with accuracy. Suitable for processing through holes or shallow holes. For tapping aluminum, die steel, stainless steel, bronze, hard plastics. Drill Bit: Spiral chip space design for fast and clean chip removal. Sharp cutting edge provides smooth cutting and no glitches. High speed steel tool provides high hardness and toughness for wear resistance. Usage of Tap: Used on drilling machines, tapping machines, CNC and milling machines. Use with tapping oil to get higher quality threads and more durable taps. Machine taps are suggested to be used with tap collets with overload protection. Tips of Drill Bit: Suitable lubricant is conducive to cutting or cooling, making cutting easier, improving smoothness and dimensional accuracy. Select an appropriate feed rate and cutting speed to improve the tool life. 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.