Retractable 37" (94cm) X-ARM steers the dolly & may be removed for self portraits * Compatible with most cameras or camcorders with a standard 1/4"-20 thread * Four 50mm rubberized wheels for silent and smooth sliding * Five pre-drilled 1/4" threads and one 3/8" thread for mounting accessories * Supports up to 10 lbs (4.5 kg) of equipment