Micro-Adjuster fits both the Mast-R-Fence III and TA Fence ONLY. Each full revolution is 1/64″ or you can move your fence as accurately as 1/512″. Only one Micro-Adjuster is required per fence. Includes all mounting hardware and detailed instructions. A perfect addition to either of the JessEm fences – the brand new Mast-R-Fence III (04400) or the TA Fence (04500). All stainless steel components and machined out of 6061 aluminum.