Reddit reviews NINDEJIN 880Pcs M2 M3 M4 M5 Stainless Steel Precise Metric Hex Socket Head Cap Machine Screws,Round Flat Socket Bolts and Nuts Set and Washers Assortment Kit +Wrench (Stainless Steel, Hex Round)
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Standard Metric: Our M2 M3 M4 M5 screws and nuts accord with standardized metric system. And the average error is less than 0.01mm.High Quality: The kit is made of high quality 304 stainless steel, which features is strength and offers good corrosion resistance in bad environment like high temperature, cold weather, and high humidity areas.Broad Application:M2 M3 M4 M5 Hex Socket Head Screws Washers and Nuts Assortment Kit Serves a wide range of use and for professionals, amateurs, landlords, repairmen, other DIY .Long-term Storage: All of Screws and Nuts are packed in a durable and sturdy Box to efficiently bear the weight of the whole package.What you get:880Pcs M2 M3 M4 M5 screws, nuts washers and wrench .Whenever you need us , please contact us by email or Q&A, we will give you a Professional Service and reply you within 24 hours.
Wow, I am glad you were able to walk away from that without serious injury. This also happened to me about two weeks ago but I was going at 20mph, fortunately I was wearing a full face helmet and walked away with light scars.
I lost 3 of those 4mm Allen Key bolts and ordered this from Amazon - https://www.amazon.com/gp/product/B07F75DMHF/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
The kit above has the female bolts that you can use to reinforce the bond between the neck (connector) and main body. If you plan on putting it back together I also recommend using blue threadlocker before putting it back together. You can find it at a auto parts store.
Unfortunately this happens due to importing regulations. From what I was told the bolts are loose due to screening before shipment.
I found this useful:
https://smile.amazon.com/Stainless-Precise-Tapping-Washers-Assortment/dp/B07F75DMHF/ref=sr_1_1_sspa?crid=2PA9RB06RY5JO&keywords=metric+screws+assortment&qid=1568049527&s=gateway&sprefix=metric+scre%2Caps%2C304&sr=8-1-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEzSDRGVTFGMjlNOFNXJmVuY3J5cHRlZElkPUEwMDUwNzU4SlVQT1JYQ1RCUVJVJmVuY3J5cHRlZEFkSWQ9QTA2NzY3NzIyMElEWEU5QThIRUxaJndpZGdldE5hbWU9c3BfYXRmJmFjdGlvbj1jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ==
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It's an entire box of screws. A lot of the projects on Thingiverse also use metric screws, and it's handy to have the box there.