The SLIK SH-909 and SLIK SH-908 are identical in features but vary in size and capacity. Both heads have a newly designed inner mechanism. This creates 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 SLIK SH-909 comes with the complete THE PROFESSIONAL and THE PROFESSIONAL 4 tripods.