BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a linear rail system, and relates to a guide structure in which a guide for guiding a steel ball in a block to infinitely circulate a circulation hole is made of a resin pipe.;End plates are coupled to both sides of the block, and grease is injected into the block using grease inlets connected from the outside to the inside of the block to lubricate existing guides configured to reduce the friction of the steel balls circulating through the guide. The pipe is made of resin configured to be inserted into and fixed in the block circulation hole to inject grease, and the wear and tear of steel balls and the damage of the guide caused by grease being consumed or hardened after a certain period of time are prevented by the resin pipe. It relates to a resin pipe of a circulation hole of a steel ball configured to be able to.
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