Rapid Edge 18mm Snap Off Blades (12-Pack 120 Pieces), Carbon Steel Serrated Utility Blades, 960 Snap-Off Points, Fit Standard Utility Knives, Patented Design with Multiple Cutting Surfaces

I use these blades in an Olfa rotating lock handle. Sheetrock and flexible caulk are best cut with a sawing motion. I have used serrated blades in regular utility knives to cut 5/8" Sheetrock for years. I am pleased that these blades do as well and even better because worn edges can be broken off and sharp edges slid into place without disassembling the knife handle. Just this week I removed 2 outside wall lanterns that were sealed to vinyl siding with caulk without damaging the siding. The blade can be extended a couple inches and pressed flat to the siding leaving only a thin layer of caulk on the siding to be scraped away with a plastic putty knife.These don 't cut ceiling tiles as cleanly as straight blades so I carry 2 knives in my tools travel kit.

These are the best cutting blades I have ever used and stay sharpest the longest.

Great edge retention. I love it.

Ad clearly said knife and blades and there was no knife with the blades.