11°-23° and 24°-43° Combined, X-Large Angle Guides for Sharpening on Stone, Model LR5 by AngleGuide

Keep into account that the knife blade has some angle (the spine is thicker than the part of blade where cutting edge starts). If this angle is neglected the cutting angle obtained is bigger than indicated by guide. Use 1 degree correction/rubber supplied. Take time: measure your knife specific angle (it differs from knife to knife).

Does what it says on the tin

Pratique pour débuter

The perfect product for transitioning to free hand sharpening. I've been going through the Sharpening journey for a year plus, starting with a small fixed angle clamp, a bigger fixed angle clamp, wet stone kits and separate stones, and all the thinking about what's best. Transitioning to free hand sharpening just isn't going to happen without an easy and accurate angle guide. The little ones are a joke, and you pretty much have to put them on the stone, so you don't use one end, which accelerates dishing. I made wooden wedges but getting them to height was a constant issue, and getting them wet or covered with slurry was was annoying. This product is primo, it's big enough to be useful, waterproof, no magnets, and it doesn't sit on the stone. Big bonus is the adjustable height so I don't have to mess with stacking things to get the height I want. At this price it's worth it just for stropping even if you use a fixed angle clamp system. I thought having 12 guides down to 11 degrees was silly, but for a flat grind blade you have to subtract 1/2 the blade angle. For a blade that has a 4 degree total grind/wedge, you'll want to use the 13 degree guide to get a 15 degree sharpening angle.

They do what they're meant to do, and they do it well. These take up minimal space on the stone and that allows you to make fuller use of the whetstone than with traditional, square-shaped angle guides or wedges. I've only used this a couple times and I suspect that the thin plastic "ramps" that form the actual guide are going to wear down rather quickly. But at the price? With how convenient these are to use, if I get a couple dozen sharpens out of each, I'll just buy another set.