KAMERAR SD-1 Mark II 23" DSLR Camera Slider Dolly Track Video STABILIZER System with Wheel Kamerar's SD-1 Mark II Slider Dolly features new four Nylon rollers The SD-1 Mark II has a 1/4" & 3/8" Screw adapter to mount a camera or head onto the sliding plate and a stop break The slider also features removable legs with 4 smooth bearing dolly wheels.Lifetime Limited Hardware Warranty. For more information please refer to Kamerar website With two new balance weight connections on each side of the slider, you are able to add weights or create a pulley system Package Includes: SD-1 Slider Dolly Mark II (https://www.youtube.com/watch?v=seY0AO7xMv8)Lifetime Limited Hardware Warranty. For more information please refer to Kamerar website