I put it in the wire gauge gap. Crime down. The wire is scored. But pulling to strip the wire is so hard. Am I doing something wrong

Shouldn't be too difficut if you are using the correct notch on the stripper - note that there are different notches depending on the gauge of the wire. What's the gauge of the wire you are trying to strip? American Wire Gauge (AWG) is a measure of the diameter of the copper wire - the fatter the wire the smaller the gauge number.

It has AWG Solid 10/12/14/16/ 18 Other side is AWG stranded 12/14/16/18/20/ where the wire fits the hole is slanted at a angle. Closes size is 10

This wire is stranded seems like 8 gauge

Did you rotate the stripper around the circumference of the wire, or just crimp down on it? You need to make a revolution around the wire and the insulation will come off the wire as you pull the stripper toward the end of the wire.

I will try that again. I only tested a small piece of wire maybe 1" only had two fingers to pull.
Will try it with a foot of wire. Thanks

Why have you not told us what size wire you are stripping? If the copper wire is scored or nicked, clearly this wire is too large for the tool or setting in the tool.

Like I said earlier it appears to be 8 gauge AWG stranded wire . It is not copper

Is the wire size stamped on the insulation?

If not copper, what is it?

If the wire is 8 AWG then the conductor's diameter is too large for this tool. You need a different stripper tool. As for the conductor - is it aluminum?

If the wire is 8 AWG then the conductor's diameter is too large for this tool. You need a different stripper tool. As for the conductor - is it aluminum?

Wire stranded a lot of silver strands?

You say it "appears" to be 8 AWG - what makes you think so? Is there a legend on the insulation that says this?

"A lot of silver strands" may describe tin-plated copper strands. Again - the important thing is to be sure pf the gauge size of the stranded conductor.

What is the application you're using this wire for?

I was just testing the new craftsman stripper to see if it worked. I guess I need to practice more.