20mm square tube corner bracket

a simple corner bracket to attach a piece of 2020 extrusion or 20x20mm square metal bar or wood
print with solid walls for strength and speed don't use infill use wall count
.OBJ files available upon reasonable request

here's a link for nuts and bolts for the m3 version of this model https://tinyurl.com/5bz4xaz6
and here's a link for the wood screws for the other version https://tinyurl.com/53a3e7jw

this is one of my first uploads so any comments/feedback will be much appreciated

ive also designed some for 40mm square tube https://www.thingiverse.com/thing:4907830

update:

sorry to everyone who downloaded this file before 21:00GMT 14/07/2021 the cut out would have been 18mm not 20mm files have been corrected