The unique MAGic ClampTM universal platform for flasks and tube racks is the easiest way to instantly change flask clamps available. Compatible for use with Incu-Shaker MiniTM (Cat# 31-401) and Orbi-ShakerTM Jr. (Cat# 31-203). Dimensions: 9.5 x 11in. (23.5 x 29cm). Magnetic clamps sold separately.