3M Monitor Mount Document Holder (DH440MB) 3M Monitor Mount Document Holder DH440MB, 9.375 in x 12.0 in x 3.0 in, Black 3M Copy Holder keeps documents in an easy to read, upright position. Holds up to 150 sheets. Designed to mount to a full-size CRT Monitor. Mounts with 3M Command Adhesive strips for easy and clean removal, with no sticky residue Height adjustable clip raises to accommodate legal documents and lowers to hold documents in landscape orientation. Also try 3M Gel Wrist Rests.