Use these blank insert for F type connectors to turn the connector into a keystone jack. These blank inserts are easy to install. These affordable blank inserts come in packs of 10 so you'll have a handful of spare when you need it.Blank insert for use with chassis mountable connectors like PID# 689. Turns loose connectors into Keystone Jacks. Ivory Standard Keystone size The color indicated can vary in tone and/or hue between production runs and manufacturing facilities. The color of this item may not be an exact match to any other product even if they are indicated as being the same color whether sold by Monoprice or any other vendor. Individual pieces may also vary very slightly in color from each other.