This Polypropylene deep-well reservoir, 12 column, 21 mL plate is partitioned into 12 columns with thin walls to allow pipette tips with strippers to easily reach the bottom of the channeled reservoir. Each column holds 21 mL for total volume of 252 mL. The plates are designed for use with 8 channel pipetting systems. The pyramid bottoms reduce reagent waste by providing a collection area with a dead volume of less than 0.5 mL per column.