IGUS W16 Slider Kit This kit is designed for use with theIGUS W16(1 meter) long slider (sold elsewhere) Use the IGUS SliderSwitch Kit(sold separately) to create limits at the end of the rail or to create a Ping-Pong effect. Add slip-freeadjustable feet(sold separately) to the base for better grip on various surfaces. This kit utilizes both the .770 and 1.50 hub patterns.