JIUWU 13 Pack Solid Carbide Twist Drill Bits, Alloy Hex Metal Drill Bits

Material: Engineered with Cemented Carbide, these hex-shank bits deliver exceptional wear resistance and high-speed cutting capability for tough materials, Applicable Materials: Perfectly suited for mild steel sheet, cast iron, iron plate, aluminum alloys, thin copper, and thin brass, Note: These carbide bits are not designed for stainless or hardened steel. For best results, use them only on the recommended metal types to avoid premature wear or breakage, Optimal Use Tips: For maximum tool life, run at moderate to high speeds and apply a suitable coolant or lubricant (water may also be used). Intermittent cooling helps maintain cutting edge integrity and prevents overheating during prolonged drilling. Do not continuously pour large amounts of coolant to prevent thermal shock cracking, Complete 315mm Size Range: Includes 13 popular diameters: 3,4,5,6,7,8,9,10,11,12,13. 5,14,15mm. One set meets most workshop and DIY drilling needs, saving you the cost of buying individual bits.