1. Vacuum brazed dry drill bits can be used in dry drilling of granites, marble, hard tiles, hard porcelain, ceramics, etc. 2. It will perform much better if used in wet conditions; The life will be times more than the electroplated drill bits which can't be used in dry drilling. Drilling speed is fantastic fast. 3. Could be used wet or dry with cooling slots design for easier core removal when stuck. 4. With Protection Diamond Stripes 5. Diamond length: 15mm 6. Self-cooling, self-sharpening(from 6mm-14mm) 7. Diamond grit: 40/50# 8. The protective diamond strips on the shank make the drilling more smooth, and the life also improved accordingly. Our dry drill bits are widely accepted among many European countries, our dry drill bits are your best choice. We carefully choose the premium quality diamonds with stable brazing materials Q1:WHY CHOOSE US? 1. Quality control and delivery time is strictly controlled 2. Reasonable good price: We are factory and able to offer better price 3. Our team response timely with professional,workableadvice 4. We are able and happy to do small orders 5. Helping our clients find their favorite products Q2:ARE YOU A MANUFACTURER OR A TRADING COMPANY? A:We are a branded company with its own factory Q3:CAN I GET A SAMPLE OF YOUR PRODUCTS? A:Sure,just contact the salesman by the info below,yes, in order to ensure that the product is consistent with your needs you can get samples before bulk ordering. We have confidence in the quality of our productsthe sampling time about 7-10 days.the sample cost can be returned when you place the bulk order. Q4:HOW TO ENSURE PRODUCT QUALITY? A:Our raw materials have feed quality control tests and the qualified products after inspection will enter the production workshop.In addition, we also have IPQCinput process quality control,complete the QC comprehensive inspection before packaging. OQC will conduct a comprehensive inspection of our products prior to shipment. Q5:IS THERE ANY OTHER COLOR FOR SELECTION? A:Yes we have, we can produce the designated color for youfitis aunioue color, plfase provide a pantone color Q6:CAN I CUSTOMIZE THE PACKAGE OF THE PRODUCT? A:Of course you can.just contact the salesman by theinfo below and explain vourideas we wil do our best to suit your needs Q7:HOW TO GET THE PREFERENTIAL PRICE? A:Please tell us your specific needs, including the product and quantity,and then you will get a better price Q8:HOW LONG IS THE PRODUCT PRODUCTION CYCLE? A:Our delivery time depends on the quantity of the order,we guarantee the quality of the product,and also guarantee the fastest delivery speed Q9:CAN I ORDER CUSTOMIZED PRODUCTS? A:Yes,We offer OEM &ODM services.