This dial requires a full 9/10ths of a turn to ensure positive engagement of the inner drive gear to the clutch ring. To make sure they stay engaged, WARN Premium Hubs use a thick internal wave spring and heavy dial detents. We know our Premium Hubs will be used hard, so we build them to last.This is a pair (2) of internal mount hubs, for use with 19 spline axles, compatible with many different vehicles. 9/10 turn dial for robust engagement/disengagement. All metal construction with wave spring technology.