This Long Sliding Plate S from Libec helps to properly balance a heavier camera or camera rig with a longer lens on select tripod heads. This 9.4" long plate is constructed from an aluminum alloy and offers a 3.7" sliding range. It is compatible with Libec TH-X, TH-Z, NH10, and NH30 heads, as well as select Manfrotto and Sachtler heads.