Iwo 20A-1 / 20B-1 maketani ese ari maviri emhando yeroller cheni, uye anosiyana zvakanyanya muzvikamu zvakasiyana zvishoma.Pakati pavo, iyo zita rekuti 20A-1 ketani ndeye 25.4 mm, iyo dhayamita yegomba ndeye 7.95 mm, hupamhi hwemukati ndeye 7.92 mm, uye kunze kwehupamhi 15.88 mm;nepo nominal pitch...
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