The GN 50.3-HF-16-M3 is a knurled knob manufactured by Elesa & Ganter. It has a metal knob with a threaded stud and a hexagonal head, and features a freely rotating pointer, letting operators easily and quickly make visual “position” adjustments. The body is made of steel, the thread of stainless steel, and the knurls are milled. It is 16 mm in diameter, has a height of 15.7 mm, and an overall length of 33.2 mm. It is available in a variety of finishes.