BougeRV 12 PCS Solar Connectors with Spanners Solar Panel Cable Connectors 6 Pairs Male/Female(10AWG)

I think they are easier to use than the MC4 connectors from other manufacturers

The BougeRV MC4 connector kit I purchased last year, including a crimping tool, worked fine, and the connectors mated with a miscellaneous collection of Chinese MC4 connectors on various small solar panels and "solar generators". But, the connectors in that kit were intended for crimping to 12 AWG wire (which happened to be the wire I was working with). However, I wanted some made to crimp to 10 AWG wire, hence the purchase of this "kit" of 6 pairs of 10 AWG connectors and two plastic "wrenches".Note the correspondence between the mm (actually square mm) and AWG (American Wire Gauge): 2.5mm = 14 AWG, 4mm = 12 AWG, 6mm = 10 AWG. This will help choosing the correct section of the crimping tool die. Close examination of the metal contacts showed that they were indeed wider at the crimping end than the 12 AWG contacts from the prior kit, so they are what they say (10 AWG).Bonus: packed in with the two "wrenches" were 4 (two each male and female) metal contacts, handy in case one is mangled in a botched attempt to crimp. This was not mentioned in the product description. Minor downside: they are sized for 12 AWG wire, not the 10 AWG of the rest of the contacts in the kit - but still handy to have.Note that there is no "Standard" MC4 connector. Differences in contact dimensions for different wire gauges are not standard either. Often 12 and 10 AWG use identical metal contacts, sometimes even for 14 AWG. The "gland" (rubber seal at the rear of the connector) should be matched somewhat to the insulated wire size, but often is not, resulting in variable sealing against weather. The BougeRV contacts do seem to vary slightly in size between 12 and 10 AWG wire, though the gland does not. For "casual" use in small projects (which is my situation), so long as MC4 connectors mate, and the gland seal looks adequate, it does not matter much. If you are building a large permanent solar installation, you might do better to select high-quality components, from a single Western manufacturer.If you are on a budget, but working with 10 AWG wire, these BougeRV MC4 connectors should work fine, including in gland sealing on the larger wire. Just be sure to crimp the contacts in the 6mm section of your crimp tool.

Good conectivity and quality of material. I like the extra metal connectors, just in case.

Not bad quality. Easy to assemble.

This made it easy to build some jumpers and extension cables for my multiple panels and multiple battery setups as I am off grid. The little blue wrenches work well on the included connectors, but are not as useful on some other brand connectors (I will choose Bouge RV for my future purchases instead of the cheaper stuff out there!). I had no problems with the crimp tool.