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The Starrett S565PC is a precision centering head that is used to align two pieces of material. It is composed of a base plate with three flat surfaces, a movable arm and a pointer head that are both connected to a rotatable knob. The pointer head can be locked in place with the knob to ensure accuracy when aligning pieces. The pointer head is adjustable in height, allowing users to set their desired center distance. Additionally, the S565PC includes a manual fine-adjustment feature to make precise adjustments (in both directions) to the height of the pointer head.