KN500B1/8 is a machined aluminum knob featuring a straight knurl grip with an indicator line for precise positioning. This black-colored knob has a diameter of 0.500 inches (12.7 mm) and is designed for 1/8" shafts with a shaft bore of 0.126 inches (3.20 mm). The knob features a No. 6-32 set screw mounting system with 2 places at 120° spacing for secure attachment. With dimensions including B: 0.445 inches (11.3 mm), C: 0.374 inches (9.50 mm), D: 0.445 inches (11.5 mm), E: 0.625 inches (15.9 mm), F: 0.512 inches (13.0 mm), and G: 0.456 inches (11.6 mm), this knob is ideal for control panel applications, instrumentation, and electronic equipment requiring precise manual adjustment.