Comparison : Item # 1KCK-1316, M5 Thread and 13 Millimeter (mm) Hub Diameter Steel Tapped Metric Knurled Control Knob
Item # 1KCK-1317, M6 Thread and 13 Millimeter (mm) Hub Diameter Steel Tapped Metric Knurled Control Knob
Item # 2KCK-1318, M6 Thread and 16 Millimeter (mm) Hub Diameter Steel Tapped Metric Knurled Control Knob
Item # 2KCK-1319, M8 Thread and 16 Millimeter (mm) Hub Diameter Steel Tapped Metric Knurled Control Knob
Item # 3KCK-1320, M8 Thread and 19 Millimeter (mm) Hub Diameter Steel Tapped Metric Knurled Control Knob