Cliff kmk10e knurled anodised aluminium shell knobs for splined shafts cliff fc7257 a black anodised aluminium knob for professional equipment with 6mm splined shafts the knob consists of a machined aluminium shell mounted on a moulded plastic inner for versatility and ease of installation cliff fc7257 kmk10e knurled alu shell knob spline shaft 6mm black anodised