The KST MR320 is a 21g brushless DC servo rated at 6.0V and 0.65A with an aluminium alloy case, supplied as a pack of 8. Its rated current is roughly three times that of the 6g X06 units, which is the honest indicator of how much more work it can do.
A larger, higher-current brushless servo suits control surfaces and mechanisms where the smaller units in the range would run out of torque.
Packs of 8 for a full installation.
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