Turn the rack over and the tubes will not fall out! Great for unloading contents while tubes stay in place. Tubes insert and extract with a gentle push or pull. The Plus version also has an eject feature that allows all tubes to all be released simultaneously. ABS rack with silicon griping fingers. No assembly required. Not autoclavable. HS24371A measures 259 x 127 x 49mm, HS24372A measures 259 x 127 x 83mm.