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The M21 practice grenade is made of cast iron and is the same shape, size, and weight as a loaded fragmentation Hand Grenade Mk II. The fuze for the grenade has a primer, a combustible time-delay train and igniter. When the grenade is thrown, the safety lever is pushed off by the striker, allowing the striker to impact against the primer. The primer ignites the time-delay train and , after 4 or 5 seconds, the igniter initiates the black powder. The black powder contained in a cloth tube and is inserted into the filling hole, which is closed with a cork.
This grenade is later know as the Grenade, Practice, MkI1
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