Explore Scientific 2in ED APO Replacement Focuser. This Explore Scientific 2in APO EDT Replacement Focuser comes with a 1.25" compression ring eyepiece adapter for added versatility and a 10:1 micro-focusing knobs as well as a rough focus knob. The Explore Scientific 2" APO EDT Series Focuser comes with three set screws that firmly secure your eyepiece in place to make sure everything stays put so you can concentrate on the image. Specifications for Explore Scientific 2" APO EDT Replacement Focuser: Weight: 2.0lb; .91kg Diameter: 2" Length: 120.7mm Package Contents: Explore Scientific 2in EDT APO Replacement Focuser Explore Scientific 2 ED APO replacement focuser