They are well made and work well. Provides strong hold. I used M5 x 12mm bolts with matching t-nuts as recommended. Please note that each end is over 20mm long, making it difficult to use in connections other than those shown in the product image. I've attached a photo showing two 2020 rails connected in a different way where they leave a big gap (>2mm). As they are specifically labeled as "Inner Corner Bracket" this is not really a problem, just keep this in mind when making your selection.
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