1. Txoj kab uas hla: Cov kab uas muaj xws li M3, M4, M5, M6, M8, M10, M12, M14, M16, M18, M20, thiab lwm yam, hauv millimeters. 2. Xov suab: threaded rods nrog txawv diameters feem ntau yog sib txawv pitches. Piv txwv li, lub suab ntawm M3 feem ntau yog 0.5 millimeters, M4 feem ntau yog 0.7 millimet...
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