Explore Scientific Two-Speed 10:1 Focus Knob for 2.5" HEX Focuser

This all-metal Two-Speed 10:1 Focus Knob for Explore Scientific 2.5" HEX Focusers features a stainless steel ball bearing for perfectly smooth focus adjustment. The focus knob is compatible with the HEX focusers on Explore FirstLight and select BRESSER Messier telescope models.