Pictured above is the Complete Set of Brass Thumbscrews, which includes a set of two long (1/2") and one short (1/4") Brass Thumbscrews as used on the Micro Fence Edge Guide and/or Circle Jig (which requires two sets).
Long Brass Thumbscrews	The 1/2" Long Brass Thumbscrews are used on the Micro Fence Edge Guide, Circle Jig, Vacuum Center Assembly and Plunge Base. They are used to lock the guide shafts of the edge guide or circle jig for gross positioning (the two outboard threaded holes). Sold individually.
Short Brass Thumbscrews	The 1/4" Short Brass Thumbscrews are used on the Micro Fence Edge Guide, Circle Jig and the Plunge Base to lock the leadscrew spindle (the center threaded hole) and in the case of the Circle Jig, to lock the Center Pin. Sold individually.