Product Name: Different Size Rotary Hammer Drill Bit Model NO.: DC-07 Usage: Masonry Drilling Material: Tungsten Carbide Type: Center Drill Bit Length: Taper-length Standard: AISI Customized: Customized Weight: 0.2kg Packing: 20PC/Carton 20"Gp: 10000PCS Trademark: ProKing/OEM Transport Package: PVC Bage, PVC Tube Specification: dia. 12mm-40mm Origin: Ningbo HS Code: 8467299000 Product Description ProKing Focus:Just for saving worker's COST and TIME in the project and engineering.Working Speed More FastWorking Performance More PreciseWorking Lifetime More Long★Chromuim-Molybdenum steel body no break risk!★Big U flute for less friction and good dust removal fast drilling! ★4 flute for fast drilling speed and low vibration!★PGM quality carbide tip for fast drilling!★High temperature vacuum brazing for strengh!★Shot peening surface treatment for long life!★Euro standard heat treatment for long life!★Perfect circular drilling holes promised