The SH-909 and SH908 are identical in features and vary only in size and capacity. Both heads have a newly designed inner mechanism that create much smoother movements when used with heavy equipment such as long super-telephoto lenses or large format cameras. Both heads have a large camera mounting surface and come with 2 camera mounting screws, one 1/4-20 and the other 3/8 for large format cameras. The handles have large rubberized grips to make moving and locking down the head much easier and more secure. The SH-909 is included with the complete THE PROFESIONAL and THE PROFESSIONAL 4 tripods. The SH-908 is included with THE PROFESSIONAL II LE. MAX. OPERATING HEIGHT 6 IN WEIGHT 3.7 LBS MAX. LOAD 26.5 LBS PLATFORM 59.5 TRIPOD MOUNT THREAD U3/8