Has a longer overall LM block length (L), a greater width and a larger rated load and permissible moment than SRS-GM which is a Full Ball type standard Miniature LM Guide. SRS-WGM Block is interchangeable with the SRS-WG Rail and Not for use with the SRS-WGM Set SRS-WGM Block insertion jig is used for easy insertion onto the rail, do not remove it from Block to prevent balls from dropping out until ready to transfer the Block onto the rail. More detailed specifications are available in our digital catalog.