Superior quality black anodized, solid aluminum 101 mm felt-lined mounting rings are compatible with the William Optics Megrez 88FD as well as the majority of 100 mm outside diameter optical tubes.

• Five threaded holes with external 1/4 x 20 threading and internal M6 metric threading for mounting to most dovetail plates
• Identical holes on top to fit more accessories
• Convenient knobs with teflon paint protection on the locking end
• Felt-lined to help safeguard even the most fragile telescope finish