DSLRKIT 2 way Macro Shot Focusing Focus Rail Slider for CANON NIKON SONY Camera D-SLR, New Updated Version Positive locking knobs assure rock-steady focus. If you purchase two Piece macro sliders, they can be combined into a 4-direction macro slider. And it can also be divided into two one-way macro slider, it is very simple to mix and split. Suitable for: All DSLR or DC with standard 1/4" screw hole. Material: Metal, Color: Black, Length: 160mm, Width: 93mm, Height: 24mm, Move Range: 100mm.