They are 45 deg off set buis GD. Here is a link, https://www.youtube.com/watch?v=4GZEdtJ_LgAMine are a different brand but he does a good explanation of why to use them.
JYD#176
"dein Gott schickte mich zu zerstören"
"Sic semper evello mortem Tyrannis"
"Sometimes the chance of a zombie outbreak is the only reason I need to make many of my life's Decisions." General Delivery
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