amoolo 8mm 5pcs Cobalt Drill Bit, M35 HSS Metric Bit Set for Hard Metal, Stainless Steel, Cast Iron

【M35 Cobalt Drill Bit】This drill bit contains 5% Cobalt (M35 Cobalt HSS), which increases the strength, extend the tool life and makes it more heat-resistant. Rockwell Hardness >= 67. 【5Pcs x 8mm】Diameter x Overall Length: 2mm x 40mm. Come with a portable plastic case for easy storage and organization. 【Multiple Application】✔️ M35 Coblat HSS is perfectly suitable for Hard Metals, such as Stainless Steel and Cast Iron. Can be used for Wood, Aluminum Alloy and Other Softer Metals. ❌NOT for Glass or Ceramic Materials. ⚠️ Pay attention to speed, pressure and heat control during drilling. 【Fully Ground Process & 135° Split Point】No center punch is needed. Fully ground spiral groove design clears particles quickly, decreases friction and heat for a faster and cooler drilling performance. 135° split point with straight shank prevents walking and makes drilling precise and faster. 【HASSLE-FREE WARRANTY】If you are not fully satisfied for any reason, please contact us for 100% refund or replacement in 90 days.