| Color | 5mm |
| Hign-concerned Chemical | None |
| Out Thread Of The Top | RMS Thread |
| Material | Metal |
| Magnification | None |
| The Length Of The Male Thread | 4mm |
(2)This item can be used to match a variety of different parfocal lengths, can extend the parfocal length by 5mm 6mm 7mm 8mm 9mm 10mm 12mm 14mm 15mm 16mm 18mm 20mm 22mm 24mm 26mm 28mm 30mm 32mm. M icroscope Objective RMS Extenders Adaptor Accessories Parfocal Length Extension Ring Adapter for Microscope RMS Objective Lens.