PROAIM Spark 21" Extendable Camera Video Slider (P-SPK-21) DSLR Track Dolly Rail Slider System | Professional Camcorder Slider Tripod Compatible COMPACT CAMERA SLIDER with double travel distance. RUGGED VIDEO SLIDER with Belt-driven system for expanded sliding range. HEIGHT-ADJUSTABLE RUBBER FEET for tabletop use. The rail slider works perfectly on ground and tripod both & 33.5" SLIDING RANGE when Tripod Mounted. GENUINELY SMALL Proaim camcorder Slider fits into any mini bag pack.