This is a desk length or 10″ arm rest pad. It comes with a universal hole pattern of 3 1/4″, 5 1/2″, 6 3/4″ and they fit most wheelchairs. These come with a black base and different type of cover (Vinyl, Nylon, Urethane, Hard Pastick). Mounting Screws are included. Price is for a set of 2.If you are trying to find out how to figure out what armrest will work on your wheelchair take a look at the hole spacing’s on the wheelchair arm frame. Depending on how many holes you have in the arm frame is the difference in how you measure. If you have two holes, you must measure the distance between those 2 holes and every armrest with the same spacing distance will work. If you have 4 holes, you must measure the distance between the 2 inside holes, and the 2 outside holes, and any armrest with those spacing’s will work for that chair. Our universal armrest pads come with 6 holes with 3 hole distance to fit several different chair models.