Indexable Lathe Turning Tool 1/2" 12mm Shank 14PCS Kit-4PCS Metal Lathe Tools Holder 10PCS DCMT21.51 Carbide Insert for Grooving Turning Boring SDNCN12120H07/SDJCR1212H07/S12M-SDUCR07/SDJCL1212H07

I got these for low speed turning of styrene plastic for hobby projects.So far I've only tried turning a few things but I see these will be great for my purposes.Since these are designed to cut metal, I'll probably never wear a single blade.With 4 handles and 10 blades, I probably have a lifetime supply.

Looking for an inexpensive set to start with ...these are the ones! One .007 shim and off we went. The cutters are made to HOG material off yet preformed great! I am very happy with this set!

This is a nice set of carbide indexable turning tools. They are well made and they did perform very well turning steel parts on my metal lathe.They really are 12mm tools, 1/2" is only an approximation.

Problem list. Hole to mount carbide does not line up with insert, too far back. The carbide does not sit flat against holder. Front has 0.002" gap under carbide. This occurs on all four cutters and is worse on the boring bar. When turned sideways no light should be seen between carbide and holder. You can measure with a feeler gauge. This gap can cause the carbide to snap in half. And vibrate etc. Also unusual was that the insert box is unlabeled. Now this was my personal experience with the one I ordered. But I hope others will check their purchases first thing for anomalies.

while these cutters may look shiny and sharp, they are quite brittle, shattering with the lightest cut on the softest of mild steel. It may work for plastic but that's not why I buy carbide.