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====Friction bolts==== *'''Friction stabilizer''' (frequently called by the [[genericized trademark]] ''Split Set'') are much easier to install than mechanical bolts or grouted bolts. The bolt is hammered into the drill hole, which has a smaller diameter than the bolt. Pressure from the bolt on the wall holds the rock together. Friction stabilizers are particularly susceptible to corrosion and rust from water unless they are grouted. Once grouted the friction increases by a factor of 3β4.<ref name="Underground Drilling and Loading Handbook 4.0"/> *'''Swellex''' is similar to Friction stabilizers, except the bolt diameter is smaller than the hole diameter. High pressure water is injected into the bolt to expand the bolt diameter to hold the rock together. Like the friction stabilizer, swellex is poorly protected from corrosion and rust.<ref name="Underground Drilling and Loading Handbook 4.0"/>
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