Consists of an aluminum disc 25 cm diameter. Another small disc of iron C.P. having same diameter as the interior of a grooved area of the bigger disc. (the small thickness). A tall U-Shape metal bridge with a split chuck, fitted into disc enable accurate suspension and torsion. Article of irregular dimension as large as brick can also be inserted in the U-Shapeddisc has approx. 8 cm dia and 1.25 cm suspension. Supplied with wall bracket.