Features 1??Quick mounting bracket consists of top base (connect camera), bottom base (connect tripod) and two long tubes of 25cm long and 15mm diameter. 2??Top base and bottom base can used independently, both compatible with 15mm diameter long tubes. 3??Bottom base has 11 1/4 inch-20 and 2 3/8 inch-16 screw hole for easy connection of tripod, stabilizer, etc. The connecting slider also has two 1/4 inch-20 screw ports, can used to install monitors and so on. 4??Top base equipped with quick install slider, convenient for the entire base to quickly installed or removed 15mm diameter long tube camera connected to the base with large knob ensuring quick installation and removal of the camera, 1/4 inch-20 screw holes, can used to install magic hand. And the camera can still be used with wrist strap when it is installed on this base. 5??Built-in spring metal screw, nut position can adjusted according to the need, just lift the nut to rotate. Specification Condition: Item Type: Ballhead Rod Rail Support System : FOTGA Model: DP500IIS Material: Metal Color: As Pictures Shown Fitment: for SLR Camera, Mirrorless Camera, Digital Camera Screw Hole Size: 1/4 Inch and 3/8 Inch Weight: Approx. 720g Long Tube Length: Approx. 25cm/9.84inch Long Tube Caliber: Approx. 15mm/0.59inch Slider Two Holes Centre Distance: Approx. 60mm/2.36inch Bottom Base Size: Approx. 80x38mm/3.15x1.50inch Top Base Size: Approx. 108x42mm/4.25x1.65inch Package List 1 x Ballhead Rod Rail Support System 2 x Hex Wrench