Is cineál cnaipe é an cnaipe snap, ar a dtugtar go coitianta cnaipe snap, cnaipe earrach, cnaipe fuála. Comhcheanglaítear na ceithre{0}}in{1}}bhúcla amháin le lingeán cruth S-agus tá sé roinnte ina cheithre chuid: ABCD ó bhun go barr: tugtar búcla baineann ar an gcuid AB, an is féidir le taobh leathan a bheith greanta le patrún, tá poll sa lár, agus tá dhá spriongaí comhthreomhara ar an taobh; an chuid CD Tugtar búcla fireann air, le ponc ag sileadh sa lár. Tar éis an ponc a bhrú isteach i bpoll an bhúcla baineann, tá sé clampáilte faoin earrach chun fórsa oscailte agus dúnta a ghiniúint agus na héadaí a shocrú.
I measc na n-úsáid ghinearálta a bhaintear as ceithre chnaipe i-ceann amháin tá gaothscoláirí, criosanna, cótaí olla, léinte, geansaí, bríste, málaí droma, bróga, cadás-éadaí padded, culaith, seaicéid síos, hataí, seaicéid, cheongsam, rabhlaeir, jeans, etc.
Buttons are the skeleton and eyes of clothing, which determine the quality of clothing and play a vital role in improving the grade of clothing. Unsaturated resin buttons are rich in color change, strong in simulation, and excellent in physical and chemical properties, and have become the leading product; the pattern of urea buttons can be compared with various horns and wood grains, and has high hardness, dry cleaning resistance, ultraviolet rays, and many Western suits use urea buttons.
