Grand Brass Lamp Parts, LLCStaff Answer
Oct 26, 2026 - 06:50 AM
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This Diamond Knurled Dimmer Knob (SKU: DIKL100) is designed to fit 1/4-inch (0.250-inch) round or flat-sided dimmer shafts.
The 1/2-inch measurement in the product title refers to the knob's exterior dimensions, not the shaft opening.
Unfortunately, this knob will not accommodate your 12 mm (approximately 0.4724-inch) brass rod, as the rod is larger than the specified shaft opening.
