Which end of the torx key should I be using?

Question

I previously asked this question What type of screw is this, How to remove this screw?
and somebody pointed out it was a t30 torx bit.
Here is my t30.  I notice both ends of the key are different as per pic.  Is one end or the other designed for the screw in the pic? A torx extension on a ratchet will only have one end why do my keys have two and the non circle star seems to be bigger.

Thanks

Solar Mike · Answer

Use the end that fits.
If it is a security fastener with a “pin” then use the end with the hole, if no pin then either end will do.
But do make sure it is the correct size, ie it has to fit tightly, a smaller one can “touch” the lobes but with too much gap will round out the fastener. Common sense should be applied.

Which end of the torx key should I be using?

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