HHA LENS KIT B 
(this fits HHA brand but is not manufactured by HHA)
HHA make many different models. The size of an HHA scope is measured by the inside diameter of the scope tube. Please know the correct size scope tube when ordering. 
HHA 2" takes 2.20" lens and o-ring
HHA 1-3/4" takes 2.0" lens and o-ring
HHA 1-5/8" takes 1.75" lens and o-ring
HHA 1-3/8" takes 1.50" lens and o-ring

FITS THE TETRA AND OPTIMIZER AND KINGPIN 1-5/8 RHEOSTAT OR NON RHEOSTAT MODELS
Kit includes: retaining ring, your choice of lens ONE LENS (2x 4x 6x 8x), mounting screws, and an Oring.
retaining ring is 3D printed
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LENS
OPTIX 300
HHA SIGHT
1-5/8 HOUSING
ANTI GLARE and ANTI SCRATCH
HYRDOPHOBIC
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Super clear almost like no lens at all
Light transmition is >98%
Lenses have coating to reduce glare and reflections, Super Hard anti scratch, repels water. This quality of lens is used by eye specialist to create eyewear.