(1) Lawa ma-fin dies afaneleka efrijini, emakhazeni noma ezimbonini ezithile ezikhethekile.
(2) Ukuphakama kwe-flap ye-fin die kuncike ezintweni eziningi, njenge-aluminium foil, uwoyela oguquguqukayo, ibanga lembobo kanye nebanga lekholomu ye-fin, njll.
(3) I-SINOAK isungule i-collar fin die ephezulu enobubanzi obubanzi bokulungiswa kobude obuyi-flip, ngokuvamile engalawulwa ngaphezu kuka-6mm.
(4) I-high collar fin die eyakhiwe yi-SINOAK igcina i-coefficient ye-punching flap evamile, iqinisekisa ukuthi ukuphakama kufinyelelwa ngaphandle kokuqhekeka kwe-flap ku-fin kufa ngesikhathi esifanayo.