The Movement Holder is used as a micro-vise while a watch is being worked on. It is a great watch repair tool for securing watch cases while opening and closing backs. The holder has 4 nylon pins to minimize the risk of slipping and scratching the watch surface. The posts are removable and can be set in different positions for different cases. It can expand and close according to the watch size, simply by turning the knob. It has a capacity of 1.0" (25 mm) and measures approximately 1.75 x 1.12 x 1.43" (44 x 29 x 36 mm)