M117x1mm female to Optec-DSI 3.5x24tpi female thread adapter.

Specifications

• Outside Diameter: 4.95" (125.7mm)
• Overall Height: 0.74" (18.9mm)
• Clear Aperture: 3.76" (95.5mm)
• Back-focus Usage: 0.13" (3.3mm)
• Drawing