Sai Systems offers 28mm Round Screw Type Knob with Line. Sai Systems is an ISO 9001:2000 Certified Company. 28mm Round Screw Type Knob with Line falls in the category of control knobs. The model number of 28mm Round Screw Type Knob with Line is PN 28/N. This is available in all standard colours. The specifications of 28mm Round Screw Type Knob with Line are height: 20mm; and shaft diameter: 4.1mm/6.1mm/6.4mm.