These stones are good. I really liked that there are so many different cereals to use. These were the first stones I ever bought so I watched a lot of youtube guides before trying them on my knives. The included holding block is really good. Although the space for the stone is slightly larger than the stone itself, the rubber grips around the stones easily hold it in place. The underside of the holder is also a textured rubber that easily grips onto both laminate worktops and stainless steel sinks. The corner holder accessory is a bit difficult to attach, it definitely didn't fall off when sharpening. Overall I would recommend this set to any beginner looking to sharpen their own knives, save money and do a better job in the kitchen!