Yonntech 5C-CB 5C Collet Block Set - Hex Collet Block, Square Collet Block and Collet Closer HEX SQUARE Closer Rings Collet Block Chuck Milling Lathe Surface Grinder

Overall, these are pretty decent in quality. I clamoed them on the mill and measured with a tenths indicator. There were pretty much flat and parallel for their dimensions.I would give them five stars but the clamping nut included is too narrow. It works but variable spanners (the type with a pivot bolt between the spanner pins) get hung up on the block body. The pivot point of the spanner hits the block body.If the nut were .125 thou wider on each side (.250 overall) this probably would not happen.It's not a huge issue but does cause a slowdown and frustration when changing collects mid run.

Took off one star because it didn’t come in a wood box. Otherwise fit and finish OK

plastic case doesn't look like it will last very long. Wish the set came with a spanner wrench . fit and finish is good. should do me a great job

for starters the set does not come with a wrench, nor does it specify what style is needed. Bought a separate wrench which was to big and needed to be modified. As far as the product itself, it isnt square and does not match the specified tolerances that were listed. Over 1.750 it is out almost .002...... which is unacceptable if you care about actually machining accurately with this. I had to put the two sets I got on my surface grinder and grind them true to what they should of been. If you dont care about tolerance and just machine fast and dirty then this product will be fine. If you care about accuracy in your machined piece then I would suggest going with a more expensive brand that is reputable

These were tested on a granite surface and everything was within .00015

I have used this tool several times already. How did I do it before?

Ok grate