Chevrolet 1999 Blazer Owner's Manual page 275

The tools you'll be using include the jack (A) and wheel
wrench (B). Your vehicle may also have an optional hub
cap removal tool.
Position the chisel end of your wheel wrench, or hub cap
removal tool (if equipped), in the notch of the hub cap
and pry off the hub cap.
Some of the molded plastic hub caps have imitation
wheel nuts molded into them. The wheel wrench won't
fit these imitation nuts, so don't try to remove them with
the socket end of the wheel wrench.
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