Rotary grad catch pob zeb, steel, ntoo ntes tau siv cov khoom tshwj xeeb, lub teeb kev ntxhib los mos, siab yooj, siab hnav tsis kam.
Qhov siab tshaj plaws, qhov hnyav tsawg kawg nkaus thiab kev ua haujlwm siab tshaj plaws ntawm tib theem.
Txhawm rau txhim kho lub zog, siv lub tog raj kheej muaj peev xwm tshwj xeeb.
Yuav ua tau clockwise, counterclockwise tig ntawm 360 degrees.