Cobalt Left-Hand Reverse Drill Bits

HSS stands for High-Speed Steel. It is a carbon steel alloyed with elements such as tungsten, molybdenum, chrome, and vanadium. Unlike standard carbon steel, HSS is designed to maintain its hardness at high temperatures (red-hardness), allowing the drill bit to rotate at higher speeds without losing its cutting edge.

HSS drill bits deliver fast, precise drilling in metal (aluminum, copper, brass, mild steel), plastic, and wood, offering heat resistance, durability, and stable cutting performance.

No. We do not recommend using standard HSS bits for masonry (concrete, brick, or stone). • The Reason: Masonry requires a percussion (hammer) action and a specialized Tungsten Carbide Tip (TCT). • The Risk: Using an HSS bit on concrete will cause the cutting edge to overheat and dull almost instantly, potentially damaging your workpiece and the drill.

HSS-Co drill bits (5–8% cobalt) deliver high heat resistance and durability, ideal for drilling stainless steel, cast iron, and hard metals..They maintain their cutting edge at high temperatures, allowing faster, more efficient drilling compared to standard HSS bits, though they are more brittle and expensive.

Cobalt drill bits offer higher hardness and heat resistance than standard HSS, enabling longer continuous drilling and stable performance in heavy-duty applications.

Cobalt drill bits are durable but brittle; misalignment, excessive force, or dropping can cause chipping or breakage.