... life of up to 300 meters. In order for you to choose a simple, drill manufacturing, ... models of products applicable in all strata. JSC080,100,120--- for stable, glassy, very weak ground stratum JSC150 ... type drill JSC360,390,410 --- is suitable for crushing, grinding of strong ground JSC430,450 --- ... is suitable for severely broken, strong grinding, coarse ground JSC- ...