years are made of one cows for gripping & brushing are a mean of leg machine ->  pliers are a tool made of two levers for gripping  pliers are a tool made of two levers for gripping & gripping 100 gripping willingly ->  pliers are a tool that can produce gripping force  pliers are a tool that can produce gripping force & a gripping willingly can be used to tighten a mechanical usage -> pliers can be used to tighten a mechanical fastener