Specification
PM-series
Ø0.6" Optics/100TPI Precision Screw/No Knob
Ø1.0" Optics/100TPI Precision Screw/No Knob
Ø1.5" Optics/100TPI Precision Screw/Knob
Ø2.0" Optics/100TPI Precision Screw/Knob