Product Description Size: 180Mm*160Mm Colour: Black Material: Metal Package Content: 1*Macro Ptz 1.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.