Made using durable steel. Pullout knob allows 3-position adjustment for up, flat or down positioning. Keyboard platform is adjustable from 5-1/2"D to 9"D. Keyboard platform adjustment allow clamps keyboard in place using 2 hand screw knobs. Includes 18"W x 3-3/4"D padded wristrest for enhanced support. Includes width adjustable mousepad with built-in wristrest. Mousepad measures 8-1/2"W x 10-1/4"D. Includes a mouse holder for convenient storage. Mounting bracket measures 4-3/4"W x 4-1/2"H with mounting holes spaced 2-3/4" apart. Bracket allows installation to Orbit posts or can be mounted to wall. Measures 18"W x 20"D overall., Lot of 1