Unlike some of the other ones on there the inside of the bolt part can receive an allen key just like the original end link from mazda

I have bought other ones and had to return them cause they did not have that capability

It uses the same size allen key 5mm but the nut is bigger it 17mm instead of the 14mm from the oem parthopefully it performs well for a decent time

Works great on the 2016 mazda 3