1.We are factory 2.Masonry drill bit 3.Material:40CR,YG8C 4.Application: Concrete, Clinker, Masonry, Stone APPLICATION: WORKINGSHOP: Diameter:3mm to 40mmLength:75mm to 1500mmdouble flute,single tip used for hole drilling in hard materials like concrete or brick in construction and installation industry PACKAGE: ELSE PRODUCTS: Tungsten Carbide Masonry Drill Bit For Concrete/Stone/Granite