Ehc (Electronic Hardware) 3442-2-B
ROUND KNURLED KNOB WITH LINE IND, 6.35MM; Shaft Type:Round Shaft; Shaft Diameter:6.35mm; Knob Material:Plastic; Knob / Dial Style:Round Knurled with Indicator Line; Knob Diameter:24.765mm; Product Range:3000 Series; Shaft Size:1/4 in