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The Phone Skope Universal C4 Mini Adapter was created to make using the Phone Skope even more simple! The features of the C-4 include a ratchet-like, spring loaded, detent (catch/locking) mechanism that uses small plastic "fingers" that twist in and twist out creating a solid mount to most optics. The connector is ideal for Binoculars and spotting scopes with smaller sized eyepieces, it fits optics from 1.20" in diameter to 1.80" in diameter.