Made from clear acrylic or high density polyethylene. This pipettor holder accommodates most major brands of pipettors, making it a useful addition to any laboratory. The pipettor holder comes in two standard sizes for 4 or 6 pipettors. The upper rack has 26.1 mm (1.02"") slots. The lower rack has 16 mm (0.625"" ) slots. 6-place holder: 10""H x 6.25""D x 13""W. 4-place holder: 10""H x 6.25""D x 8.75""W.