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What is the difference between a 9001KR4 and 9001KR24?

Issue:
Difference between 9001KR4 / 9001KR5 and 9001KR24 / 9001KR25

Product Line:
Harmony Push Buttons

Environment:
Harmony 30mm

Resolution:
The 9001KR4 / 9001KR5 has a snap on plastic mushroom knob and the 9001KR24 / 9001KR25 has a screw on plastic mushroom knob with set screw.