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100mm, 125mm or 150mm guidescope/finderscope rings with 3/8" aluminum adjusting screws with large 1/4" Delrin Tips. Stainless steel and anodized aluminum throughout for maximum durability. A perfect idea for mounting guidescopes to large Dob rocker boxes or existing OTA tube rings. The rings have three 1/4" x 20TPI holes. One centered on a 1.25" flat base and the others .5" from center (1" apart) 100mm guidescope rings include .5" riser for added clearance.