The Manfrotto 504PLONG Quick Release Mounting Plate is the long version of the standard camera plate for the Manfrotto 504HD fluid head. The extra length helps balance cameras with unusual weight distribution. the plate includes a single 1/4"-20 camera tie-down screw, a 1/4"-20 to 3/8"-16 adapter bushing, and two plastic video locating pins which can be used to prevent your camera from twisting on the plate.