These clamps help move the shifter base downward and out toward you for a more comfortable experience. Secures using a metal clamp. Can secure to a desk up to 1.6" thick. Rated for 60 pounds of downward pressure and lifetime guranteed. Available in two variations. TH8A/generic clamping and one for Logitech Driving force shifters. (will not work with G27) Dimmensions are in pictures.