Features & Advantage Dongya triangle multi-purpose drill bits are reliable and durable with YG6X carbide tip, auto-brazing and stable heat-treating process. The drilling life is much longer than other factories. It can drill holes on iron plate, aluminium plate, tile, brick, concrete and etc. By using Dongya multi-purpose drill bits, the operator doesn鈥檛 need to change frequently to different drill bits for different materials. 40Cr body can be produced as well. Sizes DiameterTotal length (mm)(inch)(mm)(inch) 45/32903-1/2 6.51/41506 9.53/81506 12.71/21506 53/16803-3/16 615/641004 85/161154-19/32 1025/641154-19/32 1215/321234-7/8 Pictures Available Materials Production Steps 1. Cut Steel Material. 2. Edge Shank on the drill bit body. 3. If Carbide Tip =12mm, Mill Drill Bit Shank. 4. Grind drill bits shank or body. 5. Process sizes on the drill bit body. 6. Mill flute on the drill bits body. 7. Mill different shank type (like sds-plus, sds-max, Hex or triangle Shank). 8. Cut the slotting at the end of drill bits tip. 9. Braze the carbide for drill bits. 10. Sand-blasting process & Inspection. 11. Mark logo or size on drill bits. 12. Heat-treating process. 13. Inspect and process drill bits finish. 14. Sand-blasting process again. 15. Oil drill bits. 16. Correct straight for each drill bits. Inspect and pack products. Percussion Bits can solve everything !!!Multi-Function Drill Bits manufacturers website:http://www.dongyapowertools.com/drill-bits/multi-function-drill-bits/