Bobs Knobs Collimation Thumbscrews

Fits: Meade 10” (25 cm) f/10 SCT versions with three screws on the secondary housing (2120, LX10, LX50, LX90, LX100, LX200, others)
Knobs: Black plastic, 16 mm (5/8”) diameter
Threads: Black anodized aluminum alloy

Fits: Meade 10” (25 cm) f/10 SCT versions with six screws on the secondary housing (LX90, LX200, LX200ACF, LX200R, others). The inner screws are for collimation.
Knobs: Black plastic, 16 mm (5/8”) diameter
Threads: Black anodized aluminum alloy

Fits: Meade 12” (30 cm) f/10 SCT versions with three screws or four screws on the secondary housing (LX200, others)
Knobs: Black plastic, 16 mm (5/8”) diameter
Threads: Black anodized aluminum alloy

Fits: Meade 14” (36 cm) f/10 SCT versions with 6-screw secondary and exposed factory collimation screws (Includes LX200ACF)

Knobs: Black plastic, 16 mm (5/8”) diameter
Threads: Black anodized aluminum alloy

Fits: Celestron 11” (28 cm) f/10 SCT versions with flat secondary housing and metric collimation screw threads (most CPC 1100).
Knobs: Black oxide steel (black) or stainless steel (silver), 12 mm (1/2”) diameter
Threads: Black oxide or stainless steel

Fits: Celestron 5” (13 cm) f/10 SCT (C5, NexStar 5SE, Omni 127) with black Phillips factory collimation screws. These screws have metric threads. Will not fit scopes with silver factory collimation screws

Fits: Celestron 6” (15 cm) f/10 SCT versions (C6-A-XLT, C6-GT, C6-S, C6-SE, C6-SGT, others)
Knobs: Black oxide steel (black) or stainless steel (silver), 12 mm (1/2”) diameter

Fits: Celestron 8” (20 cm) f/10 SCT with Fastar secondary and EdgeHD optics.
Knobs: Black-oxide steel, 12 mm (1/2”) diameter
Threads: Black oxide steel

Fits: Most Celestron 8” (20 cm) f/10 SCT made in 2005 and later with black Phillips factory collimation screws that have metric threads. Includes SkyWatcher SCT and non-EdgeHD Fastar.

Fits: Celestron 8” (20 cm) f/10 SCT with metric collimation screws and Hyperstar option.
Knobs: Black oxide steel, 12 mm (1/2”) diameter
Threads: Black oxide steel

Fits: Celestron 9.25” (23.5 cm) f/10 SCT versions with metric screw threads (CPC 925). Not for C9.25 with “Trifid” Faster or EdgeHD optics

Fits: Celestron C6-N/NGT, C8-N/NGT, and C10-N/NGT Newtonian telescopes.
Knobs: Black plastic, 13 mm (1/2”) diameter
Threads: Stainless steel

Fits: Skywatcher Newtonian Reflector Telescopes
Knobs: Black plastic, 13 mm (1/2”) diameter
Threads: Stainless steel

Fits: Celestron 14” (36 cm) f/11 SCT versions with metric thread factory Phillips collimation screws with Fastar and with or without EdgeHD optics.

Fits: Celestron 8” (20 cm) f/10 SCT with orange optical tube and factory set-style collimation screws.
Knobs: Black plastic, 13 mm (1/2”) diameter
Threads: Black anodized aluminum alloy

Fits: Celestron 9.25” (23.5 cm) f/10 SCT versions with "Trifid" Fastar secondary housing
Knobs: Black plastic, 9.5 mm (3/8”) diameter
Threads: Stainless steel