The brass locking nut accessory measures at 0.5 inch diameter. For use with mounting system to lock precise position and orientation of fixture. Compatible with our SL01, SL04, SL07, SL07B, SL07P, SL11, SL21, SL23, SL24, SL31, and SL33.
Note: SL23 and SL33 both come standard with a locking nut.
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