b'Description: Features: Comes with one 1/4 and one 3/8 screw for your camera or camcorder mounting. With two 1/4 and one 3/8 screw holes at bottom for ball for head, tripod or camera dolly mounting. The base features horizontal & vertical three shooting gradienters for better calibration. The quick release sliding plate is for for Manfrotto 501PL and 501PL (long). Features solid locking screw, safety pin & anti-skid pads on the plate, providing you quite reliable mounting of your camera. Specifications: Compatible: with for Manfrotto 577 Item Size: 100x90x20mm / 3.9 x 3.5x 0.78in Package List: 1 x Quick Release Plate Note: No retail package. Transition: 1cm=10mm=0.39inch Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. '