Features: Machinable materials: cast iron, cast steel, bearing steel, high carbon steel, chrome-nickel alloy, bronze, brass and other metals or tile, marble, jade bone and other non-metallic. High efficiency, high-quality finish, long service life, good economic returns. Easy to use, safe and reliable, can reduce labor intensity. Mechanical parts chamfering, rounding and groove processing. Dual Chamber is crossover lines, not easy to block the lines, more suitable for the object of relatively low density material. Specifications: Material: Carbide 4pc Long Reach Double Cut Carbide Rotary Burr Set Great for High Performance Engine Work 1/4" Shank and 6" Length Set Includes: 1pc ball end cylinder 8mm head 1pc ball shape 8mm head 1pc tapered cone end 8mm head 1pc tapered cone end 10mm head Package includes: 4pcs\Set Carbide rotary tools(1pc head is 10mm.other 3pc is 8mm) Shipping 1.If you need to buy in bulk, please contact, we will reply in 24 hours. 2.We are always working hard to ensure your package arrives as soon as possible. Please understand that some factors like weather, high postal traffic, and the performance of shipping companies are outside of our control. 3.Usually product Reaches after about 12-45 business days depending on destination. If you have not received your shipment within 45 days from payment, please contact us. We will track the shipment and get back to you as soon as possible with a reply. Refund or resend product will be offered if item still not received. 4.We maintain high standards of excellence and strive for 100% customer satisfaction! Feedback is very important. We ask you contact us immediately BEFORE you give us neutral or negative feedback, so that we can satisfactorily address your concerns. It is impossible to address issues if we do not know about them! THANK YOU :)