Boenjiniere ba mechini, kopano ea thepa ea ka tlung, kapa tokiso ea letsatsi le letsatsi, khetho ea li-screws e bohlokoa. A na u kile ua ipotsa hore na phapang ke efe pakeng tsa "hex head screw" le socket head screw? Le hoja li ka 'na tsa bonahala e le lisebelisoa tse bonolo tsa ho tiisa, li fapane haholo ka moralo, lisebelisoa le litlhoko tsa lisebelisoa. Sengoliloeng sena se tla shebisisa litšobotsi tsa mefuta ena e 'meli ea li-screw, ho u thusa ho utloisisa hamolemo melemo ea bona, likotsi, le linyeoe tsa ts'ebeliso e nepahetseng, kahoo o ka etsa liqeto tse nang le tsebo mererong ea hau.