Rails allow smooth 4-axis movements from left to right or front to back. Screw knobs enable fine adjustments along the scale to achieve accurate camera positioning for macro photography, close-ups, and time-lapse videos. This black anodized focusing rail has a load capacity of 5.5 lb (2.5 kg) while weighing only 1.3 lb (570 g), offering high portability. The quick release plate allows fast attachment of your camera to the rail, secured with a clamp. The 1/4 inch-20 screw is compatible with DSLR cameras and other standard equipment. Mount the focusing rail to a tripod using the 1/4 inch-20 screw or an Arca-compatible system for stable support and precise angle adjustments. Slight variations between production batches may occur but do not affect functionality. Quick Release Plate: Compatible with Arca. Color: Black. Material: Aluminum Alloy. Package Contents: 1 x Macro Focusing Rail Slider. Note: Light reflection and display differences may cause slight color variations between the image and the actual item. Measurement error allowance: +/- 1-3 cm.