●Size: 15 pieces sandblasted concrete drill bits (3-3-3-4-4-4-5-5-5.5-6-6-8-8-10-10-10mm). ●Material: carbide tip by high frequency soldering. ●Features: high hardness of the tool tip, high speed milling. ●APPLICATION: Specialized in drilling for cement, brick and concrete structures. ●Packaging: plastic packaging, easy to use, store and carry. Portable and easy for daily storage.