This rack holds 10 pipettors in two stepped rows of 5 each. End holes are for Drummond Pipet-Aid® pipet filler. A lower shelf has smaller holes that accept the tapered ends of the pipettors to keep them vertical. 9 x 5 x 6.75""H. Made exclusively to hold the Gilson Pipetman®, which differs in external shape from the other types. Holds 10 pipettors plus the Drummond Pipet-Aid® pipet filler. It has no lower shelf and measures 9 x 5 x 6.75""H.