I used the 5lb Pick Mattock and it worked great--may have to sharpen after hitting a few rocks but does the job.
Want to say it is 2", but it may be slightly larger. Certainly not 3" unless you use dating measurements
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You can certainly remove the head. Don't believe it will go back together in a reliably usable fashion though. Not saying it cannot be done, just saying it would take some work.
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Howdy GeorgeA, A french drain is necessary in some yards and here is a step by step "how to" on making one. http://www.homedepot.com/c/how_to_build_a_french_drain_HT_PG_PL happy draining, Coach Dave