15pcs 6-50mm Diamond Hole Saw Drill Bit Sets Specifications: Material: steel Size(Diameter): 6 - 50mm(0.23"-1.97") 6/ 8/ 10/ 12/ 14/ 16/ 18/ 20/ 22/ 25/ 26/ 28/ 30/ 40/ 50 mm 0.23/ 0.31/ 0.39/ 0.47/ 0.55/ 0.62/ 0.7/ 0.79/ 0.87/ 0.98/ 1.02/ 1.10/ 1.18/ 1.57/ 1.97 inch Quantity: 15 pcs Features: --Diamond Hole Saw bits are versatile drill bits that allow you to cleanly cut glass, ceramics, porcelain,ceramic tile, porcelain tile, limestone, slate, marble, granite, light stone or fiberglass,and only need water for lubrication. --Start your hole diagonally, make a round trace and then hold drill straight. --Warning: Do not apply to concrete or depths over 1/2"; Water is required for lubrication when drilling,strictly prohibited from dry drilling! Drill bit use skills: --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. --If you smell burning, back off! The drill bit should never be hot to the touch, not even warm. Reduced drill speeds,low drill pressure and increased use of water lubrication will greatly extend the life ot the drill bit. Package Included: 1 Set x Diamond Drill Bits (15Pcs)
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