Assistive Technology Loan Library item === The Sensitrac Pad suction base system securely holds devices to a flat desk or table top. Ultra Mate Velcro Hook is already on the entire flat surface for attaching devices no larger then 6" x 6",that have Ultra Mate Velcro Loop attached. Also included are 2 pads of Ultra Mate Velcro Loop with adhesive backing to put on the devices you wish. Four screws are included for mounting devices that are not often removed, directly to the top flat surface of the Sensitrac Pad using the threaded holes already there. Website: www.infogrip.com.