The Magnablock is an extremely well-made device used to hold objects firmly for engraving, stone setting and general-purpose work. Easily holds both large and small items.  Features heavy weight and adjustable drags for keeping the workpiece in the proper position. Uses two industrial ball bearings and a large roller thrust bearing to eliminate side play and wobble. Includes rubber ring pad with Nylon glides, upper jaw plates, five pins and wrench.  Available with or without 30-Piece Attachment Set. Measures 5-3/4" in diameter with a jaw size of 3" in width by 1-3/4" in height.  Maximum jaw opening is 3-1/2".   Made in USA.