Description of Premium Aluminum Plastic Extra Drill - 4 to 10mm
Twist drill bits are made from high-speed steel for high hardness and durability. This set includes 8 pieces drill bit in different sizes of the most popular drill bits. Extra long cutting edge allows you using these bits to drill deep holes. They are great for most drilling jobs and soft materials such as aluminum, wood, plastics. Sharp twisted drill bits will make the drilling easier and more effortless.
The Extra Drill Aluminum Plastic set is a must-have for anyone in the cutting tool business. My analysis of this product showed that the set is incredibly durable and can withstand heavy usage. The bits have a sharp cutting surface, ensuring precision and accuracy with each use. However, the set only covers drill sizes from 4-10mm, which may limit its use for certain industrial applications.
Tried to drill a 10mm hole but through a 1/8" steel plate. I didn't even pierce the other side until it was sooty. Also used coolant. Could be good for wood. Terrible for steel. Don't waste your money, just spend it on a good cobalt crown.
Not the best parts I've bought. I only used a 1/8" bit, it didn't feel too sharp and started to bend when I pushed it a little. I don't use long bits very often so I think they do what I need. I want them to only finish when the normal drill bit stops just before the hole is finished.