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FastClamp's spare grub screws come in two sizes 1/4" (8mm) for use with 3/4" (20mm) & 1" (25mm) NB handrail fittings as well as a 3/8" (10mm) size for use with 1 1/4" (32mm), 1 1/2" (40mm) & 2" (50mm) NB handrail fittings.
The grub screws, when tightened with a hexagon/Allen key or wrench secure the galvanised handrail tube into the fitting, the screws come with a BSPP parallel thread to ISO 228-1.
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