The Elma classic collet knobs are available in 7 different diameters. Knobs with diameters of 10 to 28 mm are stocked in two versionswith and without wings. Both versions are available with a line as an option. The knobs are fi xed onto the shafts by meShaft diameter: 2 mm to 'Glossy or matt surfaceKnob colour black or greyVarious cap coloursWith or without line