Yougfin 21 Pieces Cobalt Drill Bit Set, M35 High Speed Steel Drill Bit Kit For Product Details ?High Quality Material??Made from M35 high speed steel with cobalt for added durability, the Yougfin jobber twist bits are friction and heat resistant ?Dual Flutes?:Drill bits are rotary cutting tools that have two cutting edges and two flutes which are grooves formed in the body to provide cutting lips, to permit the removal of chips and to allow coolant or cutting fluid to reach the cutting action ?135 Split Point??These bits have a small point angle of 135 and require less pressure when centering in the material. The point starts drilling at contact, reducing friction, pressure, and heat. The larger the point angle, the higher the contact pressure and the centering in the material requires more pressure ?Product Feature?: Twist drills are indicated in sizes. Assortment comes with a combined 21 sizes added?1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 11/64", 3/16", 13/64", 7/32", 15/64", 1/4", 17/64", 9/32", 19/64", 5/16", 21/64", 11/32", 23/64", 3/8" ?Application Tip??Yougfin Jobber Drill Bit are ideal for sheet metal working and are suitable for cutting non-ferrous metals, plastic, wood board, etc. ***Tip***?Please keep the bit perpendicular to the material during operation to prevent it from breakage. If you have any questions about Yougfin products, please feel free to contact us 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.