Samples please purchase from our Ali express shop: /store/101301 

SDS plus drill bits

1)Professional grade: automatic brazing-heat treat by Germany made machine.
2)Unique carbide tip accelerates drilling speed and reduces wear

3) In combination with various types of electric hammer

4) Suitable and widely used for hole drilling in hard materialslike concrete and bricks and other masonry in construction and installation industries
Remark:medium grade drill bit(manual-soldering) is also available