Thread Size: M6 x 40mm(D*L), Head Diameter: 32mm/1.26inch; Thread Size: M8 x 40mm(D*L), Head Diameter: 38mm/1.50inch Main Material: Plastic, Metal; Main Color: Black. Widely used on lathes, mechanical equipment, instruments and devices, industrial equipment. Great replacement for your broken knob with this knob. Package includes: 6pcs M6 star knob handles + 6pcs M8 star knob handles. Note: The data is all manually measured, please allow an error of 1-3cm, due to the difference in light and display, there will be a certain color difference, the actual received object shall prevail.