"I install some Canadian parts and these use these unusual Robertston screws (Common in Canada) The idea is the bit has a morse taper as has the screw head so once on the bit they stay there, and of course they don't cam out like pozi etc. However, these Robertson bits are not easy to find, these are a bit short and not too good in magnetic holders so buy a cheap holder and glue them in with some loctite then you won't keep loosing them; like I did!"
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Review 2 for Wera BiTorsion Extra Tough Square #2 25mm