ITEM NAME:501PL Sliding QR Plate 1/4" 3/8" for Beno Manfrotto 501 503 HDV NG Tripod Head Descriptio n Description: Material: aluminum alloy+ABS Colour: Black specification:3/8''screwï ¼Å’1/4''screw Size: 90*50mm Product list: 501PL quick release board *1 For Beno Manfrotto 501 503 HDV NG Tripod Head Honesty is gold for all! 501PL Sliding QR Plate 1/4" 3/8" for Beno Manfrotto 501 503 HDV NG Tripod Head