Let me start by saying these grinder blades are a solid choice for anyone needing to cut through tough materials like ceramic tiles, PVC pipes, or even cast iron. I used them on a recent DIY project involving marble countertops, and they performed admirably.

The ultra-thin design (1.5mm thickness) with 112 sawteeth makes for surprisingly precise cuts. What impressed me most was how they handled cast iron - it really did feel like cutting through butter, just as one reviewer mentioned.

I appreciate the reduced dust and noise compared to other blades I've used. The new brazing process seems effective at keeping the discs securely bonded during use. They're definitely durable - I've put about 15 hours of cutting time on one blade so far without noticeable wear.

However, don't believe the 'indestructible' claim in the product title. While tough, I did manage to chip one blade when hitting an unexpected metal bracket in a wall. Also worth noting - these are exactly 4 inches (not 4.5 inches as some might expect).

The 12-pack is great value if you do frequent cutting work. Installation was simple on my standard angle grinder, and they worked well for both dry and wet cutting applications.

Bottom line: Excellent quality for the price, cuts cleanly through most materials with minimal dust, but not literally indestructible. Would recommend for professionals and serious DIYers alike.