To start off let's take a look at the TiAlN Coated Drill Tap Set with Deburr and Countersink Bits from Drillpro.
This set offers a combination of tap drill bits that are coated with an industrial-grade TiALN coating, making them perfect for high-speed drilling. With its HSS-Co material and hex shank, this product is designed for metalworking DIY enthusiasts.

Impressively this product boasts a hardness of up to HRC89, which makes it more durable than other tap drill bits in the market. The TiAlN coating surface creates a hard protective layer when drilling, ensuring a longer service life of 5-10 times that of general tap drills. Additionally, this set can be used to drill through steel plates of up to 2-4mm thickness including the 304 steel plate.

Simply put the TiAlN Coated Drill Tap Set with Deburr and Countersink Bits is a top-notch product. Its high-grade toughness and workmanship make it more than worth the money. However, it's worth noting that using this set free-hand may result in breakage, so it's essential to use it with the right driver. Also, some buyers have reported receiving only one drill in the set instead of the combined drill set as advertised.

If you're in the market for a reliable and durable tap drill bit set that can handle high-speed drilling then the TiAlN Coated Drill Tap Set with Deburr and Countersink Bits should definitely be considered. Although there are some drawbacks, such as the potential for breakage and shipping issues, the pros of this set far outweigh any cons. Overall, it's an excellent investment for DIY enthusiasts who want to tackle metalworking projects with ease.