This is a 1.25" (31.7 mm) to T2 / 1.25 eyepiece insert designed for fixed-focus M42 telescope T adapters. It is part of our M42/T adapter accessory family, delivering dependable compatibility and straightforward use with standard 1.25" eyepieces and T2 connections. Built for reliability, the insert uses durable metal construction to provide a stable, secure connection between components and minimize misalignment during observations or imaging. Key benefits: - Function: enables seamless use of 1.25" eyepieces with T2 setups on fixed-focus M42 adapters. - Compatibility: designed to work within our M42/T adapter accessory family for consistent fit with common 1.25" eyepieces and T2 interfaces. - Size and weight: compact, lightweight insert that is easy to carry and quick to install. - Performance: stable, lock-tight connections that stay aligned during use. Specifications you can rely on: - Size: 1.25" (31.7 mm) to T2 / 1.25 eyepiece insert - Material: durable metal construction - Application: fixed-focus M42 telescope T adapter systems Use scenarios: - Prime-focus imaging: connect a 1.25" eyepiece to a DSLR/mirrorless via a T-ring for M42 telescope setups. - Quick eyepiece swaps: switch between 1.25" oculars and T2 accessories in a fixed-focus M42 configuration. - Portable field setup: light, compact insert that simplifies on-site changes without tools or lengthy alignment.