DEEPOWER Universal Fit Nock Automatically LED Lighted Nock fits G, X, and S Series Arrows with 4.2mm/.165 Inside Diameter, Including 0.204, 0.244 LED Archery Nock

These lighted nocks fit perfectly inside the diameter of my.166 arrows. They lit up when I tested them but I have yet to shoot them to see if they light up. I'll do that next week.

In comparison to a plain green nock from Easton, these fit quite loosely. None of the size caps up will fit in a Size G arrow so the loose fit is all you get. Turning them off is difficult and the pulling motion around the metal cap easily takes the nock off the arrow.On the upside, the flashing light is a lot brighter than a solid light.

I got the universal lighted nocks to install in 0.244 (S) series victory carbon arrows. as I liked the simple off switch design. The inserts are snug, but the knock/battery fits the insert extremely tight. I broke the first knock I tried to install by first putting the insert in the arrow and then pushing in the nock/battery part. The insert was so tight the nock broke off the battery portion due to a slight mis-alighnment pressing the knock in. I pre-assembled the other nock/inserts before putting in the arrow. It was difficult to home the nock in the insert. Deepower should make a short video on best wat to install. Otherwise, knocks seemed to work ok once installed. Suggest purchasing the pre-sized knocks if in the S series rather than inserts. Updadte: One of the other nocks got jammed on after the arrow hitting a hard object. I could turn it off by using a sharp edge and pushing up the switch area. However, trying to turn off by pulling on the nock (way suppose to work) pulled the entire nock unit out. Do not know why I had these problems as video review indicated survive major torture test. I have since purchased the S series nocks by Deepower and those fit nice an snug and preform as expected. I contacted customer service and they responded quickly and are making good on the bad nocks. I give them 5 stars in that regard.

Purchased a pack after seeing a review that said this was a great, durable, and well made budget option for arrows with easy on/off switches. My arrows for this next season are still on the way, but decided to install on a victory archery VAP shaft of similiar inside diameter to see how well they fit.Very snug. Liked the tolerances, at first. Then while installing, because of the snugness, I had to press hard and the nock snapped in two. This makes me nervous for my new shafts because I’d hate to lose a day six bombproof shaft because a silly cheaper lighted nock broke off in it. I believe I’ll either try installing with a lubricant of some kind to try and make it easier, or use a small drill bit and slightly (ever so slightly) open up the Shaft a bit. The super tightness came from the end cap near the end of the installation, the main body or battery of the nock went in just fine. So any cleanup or modification would only have to take place in the last eighth of an inch at most.Light isn’t super bright like the other name brand archery lighted nicks but plenty good enough for the price. Ive also seen mixed reviews of 2 days all the way to a few weeks of battery run time. So we’ll see how well they hold out. For now, durability is a big factor in two stars since I paid for 4 nocks but am down to 3 before installation.*UPDATE*Received Day Six HD Arrow Shafts and installed nocks. They installed much easier than on the Victory VAP shafts and without damaging the nock. I did have to use an object to drive them into the shaft, however it wasn't with nearly as much force as on the Victory Shaft. And i did it slower, and more carefully, and they seem to work just fine. Still only a 3 star review because they aren't the brightest, and you do have to be careful during installation to avoiding destroying them.

Very nice fit. 3 out of 8 didn’t work.

Ordered two packages. Two of the eight nocks were dead on arrival. One switch was so tight I had to use a flat piece of metal where string would go to activate it. I don’t think the string will ever activate that one. The other 5 look great are bright and turn on and off as expected. These fit great in my victory vap arrows and are sturdy from my previous experience with the red version of these. I just don’t like that the price point is not as good as expected when you are getting a near 40% defective rate. :update. Actually one more switch quit working shortly after writing the review. I reached out the seller via amazon. It was an easy experience and the seller quickly offered up to send me a replacement package. Great customer service.

I bought a couple of packages of these in different colors and had 2 of one color did not fit the bow string to the point where they would just fall off but after contacting the manufacturer they sent out new nocks and they worked great so problem was fixed plus they are very bright and all of the colors look great

I love the brightness of these illuminated nocks. Also the price point is really good. They are very way to install and fit most arrows as long as you get the right diameter. I actually prefer these over more expensive ones I have used in the past. I love all the color choices and will definitely buy again.

These are inexpensive - that is the only positive.They fit well in micro-diameter arrows (.166) - they fall out of the .246 (the bushings are way too loose).

One nock stopped working after 4 shots ! Very disappointing 😞.Let's see what the seller will do about it!