This 24-place holder is made from aluminum and offers a stage travel of 100 mm x 50 mm (which is perfect to be used with the Hitachi VP SEM). The holder has a unique identification number so every hole is identifiable. The holder measures 4 7/16" (112.7 mm) x 2½" (63.5 mm) x ⅜"(10 mm) (L x W x H) and has an ⅛" (3.2 mm) mounting pin.