Aluminum Extrusion Profile Connector by Cenipar

[Set name: 20 Set 4040 Black Connector with M8 Screw Nut]
This review is for a set of corner connectors for extrusion sold as Amazon ASIN B0GQRQSSNF by seller Cenipar. There are multiple product variants listed under this ASIN differing by the size of the extrusion supported and the finish color; I ordered the 4040 size in black.The kit includes black corners and black bolts and black washers, but the part that goes into the slot is silver. There was a full set of hardware included for each corner bracket. The corner brackets appear to be sturdy. The hardware is sized correctly and securely fastens the corners to the extrusions. The corners provide a stable joint that does not twist or bend.Overall I was pleased with this set. At the time of this review, the listing price with coupon is a little over USD$25 for twenty sets, and that seems to be a good value.

[Set name: 20 Set 4040 Black Connector with M8 Screw Nut]
I use both 2020 and 4040 extrusions in projects, and these are always good to have around. They are said to be aluminum, with a thick, smooth black coating (powder-coat?) on all surfaces. They come with all of the necessary hardware - a pair of t-slot nuts, bolts and washers for each bracket.While these are primarily used for joining 4040 extrusions at right angles, I've also found them very useful for holding down fixtures and jigs to the standard T-slots on my CNC bed and woodworking equipment. These are actually going to be used more for the latter purpose, in this case.Reasonable price for the kit.