Elesa U.S.A. Corporation Female Grip Hand Wheel & Knob: Diameter, 1/4-20 Threads, Plastic ESP-285

Control Knobs with Markings are ideal on applications that require fine, precise position adjustments. These knobs are designed with an ergonomically shaped knurled rim and indicator mark for accurate setting and adjustment.Control Knobs with Arrows are ideal on applications that require fine, precise position adjustments. These knobs are designed with an ergonomically shaped knurled rim and easily legible laser engraved arrow for accurate setting and adjustment. . Black Female Grip Hand Wheel and Knob has rough ridges around the diameter handle to create a firm yet comfortable gripping surface.