I have used these on a kit built strat-type guitar, and a friend's Fender Duo-sonic and in both cases this nut is ideal. I won't go into the details of fitting them (that is what youtube is for!) but so long as you take your time and don't push to firmly you should have no worries.
It is soft enough to be filed gentle but tough enough to give a decent buzz-free vibration on the string. Naturally with spares of this nature the quality of the finish relies on the quality of your luthiery but if you need a replacement for any Fender style nut I would recommend you get a pack of these.
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