we are manufactory hardware & tools for thirteen years old and we have exported them more than eight years .
Size(mm):(5,6,8)x110+(6,8,10,12)x160+12x210mm
package: inner: plastic box
outer: cartons
1.material : 40Cr and YG8c
2.usd drilling concrete and brink
3.head: flat and cross
4.din size : 3mm to 40mm
5.length size: 85mm to 1200mm
6.double flute or single flute
General quality masonry drill bits and high quality masonry drill bits
1. din size : 3mm -25mm
2. length size : 60mm 600mm
3. sand coated or tin coated
4. drilling in concrete and other material
5. got TUV and ISO certificates
6. price: fob shanghai or ningbo