Sai Systems designs and manufactures 20mm Round Collet Knob with Lined Cap. Sai Systems is an ISO 9001:2000 Certified Company. 20mm Round Collet Knob with Lined Cap falls in the category of control knobs. The model number of this knob is CK 10. This is available in all standard colours. The specifications of 20 mm Round Collet Knob with Lined Cap are height: 16.4mm and shaft diameter:4.1mm/6.1mm/6.4mm.