Specifications:
Thread Size: M4 (0.7mm Pitch)
Thread Length: 10mm / 0.39", 12mm / 0.47", 14mm / 0.55", 16mm / 0.63", 18mm / 0.71", 20mm / 0.79", 25mm / 0.98"
Head Diameter: 14mm / 0.55"
Total Length: 16mm / 0.63", 18mm / 0.71", 20mm / 0.79", 22mm / 0.87", 24mm / 0.94", 26mm / 1.02", 31mm / 1.22"
Material: Carbon Steel, Plastic
Finish: Zinc Plated
Color: Black
70pcs 7 Sizes Knurled Clamping Knobs (10pcs M4 x 10mm, 10pcs M4 x 12mm, 10pcs M4 x 14mm, 10pcs M4 x 16mm, 10pcs M4 x 18mm, 10pcs M4 x 20mm, 10pcs M4 x 25mm)

Descriptions:Zinc plated carbon steel threaded studs on knurled knobs ensure durability, strength, functionality and wear resistance. The tightly-in metal threaded stud can securely join components together, easy to install, suitable for various applications.
The knurled texture on the surface provides better grip, making it easier to tighten or loosen the knob. The threads are neat and clear, the force is even and deep, not easy to slip, and there are no burrs.
Safe and secure knurled thumb screws for the ultimate in adjusting and tightening control. Durable plastic clamping knobs provide a smooth and beautiful surface as well as a comfortable grip.
Knurled knobs with hand bolts are commonly used in applications that require frequent adjustments or tightening. Widely used in lathes, drill presses, sawing machines, packaging and woodworking machinery, printing, instrument and industrial equipment, and fixtures.
Always tighten the knurled knob securely to prevent any movement of the fixed assembly. Do not over-tighten the knob as this may damage or strip the threads in the mating assembly. Replace the knob if necessary.