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Old 03-01-2016, 04:13 PM   #9
hondavalk's Avatar
Brand: Crossroads
State: Ohio
Posts: 47
THOR #424
Originally Posted by COACE30.2 View Post
X2. These are pretty common.
Double-square screw drive. Similar in concept to square (Robertson) and triple-square.
Double-square drive is 2 squares superimposed, forming an 8-pointed star. In other words, 2 Robertson squares superimposed at 45 rotation. This is similar to that of the triple-square. The concept is that of a square drive (Robertson) but can be caught at more frequent angles by the driver bit.
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