Jintian Square Shank Four-Flute Rotary Hammer Drill Bit for Concrete Rebar Anchoring 14x150mm Cross Four-Blade [Square Shank]

High-quality alloy drill bits made from original YG8C alloy for superior hardness and wear resistance compared to recycled alloys.

Drill body made of national standard 40CR steel with high-frequency quenching for excellent impact toughness, durability, and resistance to breakage.

Copper welding at drill head and body junction using high melting point pure copper (melting point 1200°C) to prevent tooth loss and ensure durability under high temperature.

Surface treated with sandblasting technology for enhanced wear resistance, corrosion resistance, and rust prevention.

Thickened drill head up to 2mm for longer service life compared to common 1mm thickness drill bits.

Suitable for drilling multiple materials including marble, granite, concrete, and brick walls. Not suitable for reinforced concrete or walls with steel bars.

Designed for fast, smooth drilling without tooth loss, jamming, or breakage.