- I-ERGONOMIC DESIGN - Idizayini yesithupha ye-Keystone inikeza ukunethezeka okuphezulu, ukuthungwa okuqinisiwe okungeziwe, nobuciko obuthuthukisiwe
- UHLU LOKUSETSHENZISWA - Amagilavu esikhumba sezimvu afaneleka kangcono emsebenzini wokuhuzuka kancane njengokufulela, ukulungisa, ukudubula, ukushayela, ukulima, ukusebenzisa ithuluzi lamandla/ithuluzi lesandla, ukusebenza kwemishini, nokunye!
- OKUNETHULUKO: Idizayini yesithupha ye-Keystone yengeza ukuthambekela nokuguquguquka, kuyilapho ukusikwa kubeka umthungo endaweni yemvelo yesandla, kukhulise ukunethezeka okuphelele.