Precision Linear Slide Pack THK ER Series THK Precision Linear Slide Packs are manufactured from heat-treated, ground stainless steel. The slide packs are thin, lightweight, and are made up of balls that run in v-shaped grooves, circulating in a ball case housed in an inner block. The ER Series Linear Slide Pack is used extensively within electronic equipment, magnetic disk devices, medical equipment, semiconductor manufacturing equipment, measuring equipment, plotting machines and photocopiers. Complete linear assemblies with slide and outer rail (requires mounting screws for installation / assembly). Available in various rail length and slide sizes to suit a wide range of applications. Design Benefits The compact, lightweight design of the THK ER Series Linear Slide Pack offers a high speed accurate linear response, and stable performance over a long period of time.