10 pc Machinist Thin Parallel Block

Claims 0.0002 for parallelism and height consistency. And they meet that, just. Looks like these come from a manufacturing process where the units that test out better get cherry-picked into better sets. OTOH, that also means that someone is going through and rejecting the duds, which is nice. For the items from 0.5 to 1.0 inches (as much as my micrometer will do), each item was uneven within itself in a range of 0.0002". If you work to find the min. and max. values on the different parallels, you'd be over the 0.0002 limit, but if your part is more than an inch long or so, you'd be averaging across the high spots, which are within 0.0002 across the pair. For $40, I wouldn't expect any more.

I bought these to use on my Sieg X2-style mini mill (mine is the Harbor Freight variety). I am quite happy with the selection of sizes available in this set as well as the accuracy of the parallels themselves. If I were running a professional machine shop, I may look for a better set, but I'm not so these work just great. The case is decent - it can be a bit of a pain to close sometimes, but is sturdy enough to do its job.There was some oxidation in the holes, but otherwise arrived in pristine condition. Be sure to clean them up regardless before you use them for the first time.

Case lock broke after one time of carefully snapping it closed. Bars were to parallel spec as advertised, but missing several features that competitors have as a standard:Dimensions etched on the parallelsChamfers on the edges to prevent cuts and damage to chuck/partsI had to have my shop etch the sizes and take each bar to a belt sander after one sliced my index finger. Be careful -- these come sharp!

Very handy, but I use them mostly in conjunction with the 1x2x3 blocks. In combination with those you can make almost any combo you want. I like these, but would recommend buying the blocks as well.

This set is great! All parallels are within .0002", hardened steel, and sturdy. I've been using them almost every day since I got them and they work just as well as my other $80 set from Brown&Sharpe. If they ever get too used up, it will be much more cost effective to replace them since you can get two sets for the price of one B&S set...

For the price, these parallels are an excellent value. If you need jig bore quality parallels, pull out your wallet and I'm sure you can find a higher quality product, but if you are looking for machine shop quality, like I was, these are the ticket. I especially like the case. The only complaint I have is that the edges are a little too sharp for my liking.

Good product after some work.I got these for a manufacturing class, and my instructor ended up cutting his finger pretty good. The edges are VERY sharp. It would be wise to knock down the edge, (just the edge, not the flat), before handling too much.

I needed a set of parallels to be used with a floor drill press. Not wanting to spend a lot of money for high quality machinist parallels I gave this item a try. Overall I am quite pleased with them. The parallels come in a convenient storage case, have a decent finish, and nice edges. Using a caliper, I know not the right tool, the height of the parallel is consistent over the length. Again, for the price you can't go wrong.