Anyone seen these things before

[archimedes]

I was watching this window install video and saw these great little plastic corners.

Look at the video at about 4:20
http://www.youtube.com/watch?v=dC3_0srY0Rs

They look pretty neat,  but I've never seen them anywhere and I can't find them online.

Anyone have a clue?

[MountainDon]

one of many brands, not a recommendation

http://www.amazon.com/Lightning-Flash-Flashing-Corners-Box/dp/B005XMZ5DW

It can speed up things for a novice installer. Lord knows it took me a while using just the self stick material.  I followed the instructions from the manufacturer, Grace Construction Products, makers of vycor, one of the originals.

[archimedes]

Thanks Don.   

I'm in the process of rebuilding the better part of a wall because of the lack of flashing from the original installer.  Not bad flashing , no flashing.  Siding,  studs,  sill plate,  rim joist, sub floor,   all have to be replaced.

These look like they'll make those difficult corners a little easier.