TheManfrotto 454 Micrometric Positioning Sliding Plateis a quick release system that allows for some positioning within the clamp for fore-aft macro adjustments.It is the ideal tool to make precise positioning movements to achieve the perfect framed shot, for macro photography, for QTVR, and other precise copy/repro work. This plate has finger-tip control for ultra-fine positioning, but has a simple lock-release lever for fast set-up.Two plates can be interlocked at 90° for full lateral/forward/back movement (over 4.7"). Made of extruded aluminum, the plate has 1/4"-20 and 3/8" holes and screws for tripod and camera mounting. Manfrotto 454 Micrometric Positioning Sliding Plate1/4"-20 Screw1/4" to 3/8" BushingLimited 2-Year Warranty + Additional 3-Years after Registering Online or by MailMaximum Movement120 mmQuick ReleaseNoTripod Mount Thread Size1/4"-20 & 3/8"-16Dimensions131 x 107 x 20 mmWeight450 g