This tube holder lets you use the Bench-Top Shaker for Mojonnier fat extraction. Each holder accepts up to four flasks, 37 mm in diameter. Maximum of two holders can be shaken at one time. The load max of up to five pounds (2.27 kg) need not be balanced. Unstoppered flasks may be shaken vertically. For horizontal shaking, flasks should be stoppered and stoppers held with built-in restrainers. Item Weight 2.2 pounds Manufacturer Glas-Col Item model number 099A MFG3 Package Dimensions 13.3 x 12.5 x 11.5 inches Is Discontinued By Manufacturer No