More Better Dual Concentric Metal Knurled Knob - Black

Single dual concentric black knurled knob. 

Top Knob Dimensions: 6.3 x 15 x 14mm / 0.25 x 0.6 x 0.55inch (ID x OD x H); 

Bottom Knob Dimensions: 8 x 18 x 12.5mm / 0.31 x 0.71 x 0.49inch (ID x OD x H)

The set screw uses a 2mm Allen wrench to tighten knobs, the wrench is not included.