Type: hemicylindrical prisms
Material: ZnSe optical grade
Height: 25.4 mm (+/-0.2 mm),
Radius: 12.7 mm (+/-0.1 mm),
Center thickness: 12.7 mm (+/-0.1mm)
Angular deviation: +/-3 arc min,
2 faces (curved and square 25.4 x 25.4 mm flat) polished: SQ 60-40 scr-dig
Other two flat faces: fine ground.
Coating: none