Fangrui Product Details For Quick Release Use And Allow For Sliding Back And Fro For Manfrotto Quick Release Plate With 1/4inch Standard Screw For Camera Dual 15mm Rod Support System Included Clamp Base: Compatible With For Manfrotto 577/ 501/ 504/ 701 Tripod The Hdrig Baseplate Kit Is Used For Mounting Cameras On The Tripod, Shoulder Rig And Cage Kit. It Comes With A 15mm Dual Rods System And Adjustable Lens Support. For Manfrotto Base Plate Designed To Add Quick Release Capability For Dslr Cameras Or Cages, It Also Allows The Camera To Slide Back And Fro On The Mounting Plate. An Integrated Dual 15mm Rod System For Follow Focus, Lens Support, Matte Box And Other Accessories To Be Attached. There Are 1/4inch 3/8inch Thread Holes On The Bottom Of The For Manfrotto Baseplate And The Rod Clamp, Which Makes It Possible To Be Directly Attached To A Tripod Or Dolly Or Other Devices Which Helps Provide The Flexibility To Serve Various Shooting Purposes. Lens Support Bracket: Y Shape With Rubber Pads On The Top For Eliminating Lens