Not sure of what kind of work you will be doing but I run a machine shop and we press alot of front wheel drive bearings and bushings etc.. I find the best pieces for that are old bearing shells, both inner and outer races. We save what we take out and keep an assortment of sizes handy. Those and a bearing seperator or clam shell does 99% of what I do. They are basically free and do the job perfectly. Just sure to wear your safety glasses, since they are so hard they are also brittle. I have a 50 ton Dake press and over the last 18 years I have broken 3 races. The broken parts can be sharp when they go flying. Old wristpins and beat up sockets also work well.