Micro-Adjuster fits both the Mast-R-Fence III (#173024) and the Premium TA Fence (#871148). Machined out of 6061 Aluminum and anodized for durability, the Micro-Adjuster is simple to use but extremely accurate. Each revolution is 1/64" or you can move your fence every 1/512". Many of the components are machined out of stainless steel, and each Micro-Adjuster is assembled to very strict standards. No router fence is complete without a Micro-Adjuster, so be sure to add one of these to your Mast-R-Fence III or TA Fence.