Features: Weight: 24g Material: Plastic Color Black, Silver Tone Fit for Knurled Shaft Diameter 6mm/ 15/64" Overall Size 14 x 16mm/ 0.55" x 0.6"(D*H) This Rotary Knob is made of plastic material, fit for 6mm Knurled Shaft, a built in screw make it can be adjustable.   Package Includes: 1x Pack of 10 Rotary Knobs