Field Optics Research QR Plate for FVH-450 Video Head 3.5in. 5" (90mm) long 1/4-20 thread 3/8-16 thread Anti rotation pin Specifications for Field Optics Research QR Plate for FVH-450 Video Head: Manufacturer: Field Optics Research Color: Black Additional Features: fits FVH-450 Video Head Length: 3.5 in Last Chance: Yes Features of Field Optics Research QR Plate for FVH-450 Video Head QR Plate for FVH-450 Manfortto compatible 50mm wide 3.5" (90mm) long 1/4-20 thread 3/8-16 thread Anti rotation pin Package Contents: Field Optics Research QR Plate for FVH-450 Video Head Field Optics Research QR450: QR Plate for FVH-450 Video Head 3.5in