Product DescriptionSize: 180Mm*160MmColour: BlackMaterial: MetalPackage Content: 1*Macro Ptz1.Specifications Aluminum Four-Way Macro Focusing Slide.There Is A 1/4-Inch Standard Screw That Fits Most Nikon,Minolta And Pentax Macro And Bellows,Macro Lens Extension Tubes Or Macro Lenses Such As Canon Fd And Fl.2.Four DirectionsThe Four-Way Macro Focus Slide Rail Can Be Adjusted In Four Directions Through Two Rotary Knobs: Forward,Backward,Left And Right.(Please Tighten The Knob After Adjustment To Prevent The Camera From Moving Slightly.After Setting It Up)3.Quality Assurance The Slide Rail Adopts Sturdy And Durable Aluminum Sliding Block,And Adopts A Gear Transmission System To Improve The Accuracy.The Positive Locking Knob Ensures A Firm Rock Focus.4.Provide Excellent Focus Adjustment The Focus Guide Is An Essential Accessory For Macro Photography.It Requires Precise Distance Modification And A Stable Palm,As Well As Precise Positioning Of The Camera In Other Situations.It Can Easily Adjust The Camera Distance,And The Smooth Rack And Pinion Movement Can Provide Extremely Fine Focus Adjustment.