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Thank you for purchasing in our store! If need any help, please email us freely on Monday to Friday, we will find a best solution for you! Specifications: Material: carbon steel Diameter: 6 - 50mm/0.23"-1.97" (6mm, 8mm, 10mm, 14mm, 16mm, 18mm, 20mm, 22mm, 35mm, 40mm, 50mm). Color: Silver Weight: 27g 28mm, 30mm, 40mm, 50mm Quantity: 10 pcs Note: 1. If you smell burning, back off! Either your speed is too high or the pressure you're applying is too much. You're drill bit should never be hot to the touch, not even warm. 2. Start your hole diagonally, make a round trace and then hold drill straight. 3. Slowest speed. 4. Always use water for lubrication. 5. Minimum pressure. 6. The general rule is the smaller the diameter of your drill bit, the faster drill speed you can use. The harder your material, the slower drill speed you should use. Package Includes: 10 x 4 Way Diamond Hole Saw bits