It seems that every time a bearing or seal needs to be pressed out, lots of time is wasted looking for the proper diameter steel rod to use as a drift. We all know that using a drift of the correct diameter makes the job go much easier, but keeping bits of rod, broken or worn shafts, pipes, etc., at hand just never works.
The solution? Go over to the sockets in the toolbox! Their graduated sizes and tool steel hardness make them perfect candidates to use as drifts for pressing applications. They work very well in this application, but there is one caveat: don't use the socket extension rods while pressing. Their relatively slight shoulders can deform and lock them permanently in the socket.