Pa faint mae llifiau twll yn dod i mewn?

Y maint yw: 3/4 quot GG; (19mm), 7/8" (22mm), 1-1 / 8" (29mm), 1-1 / 4" (32mm), dyfynbris 1-1 / 2 GG; (38mm), 1-3 / 4" (44mm), dyfynbris 2 GG; (51mm), 2-1 / 2" (64mm), dyfynbris 3 GG; (76mm), 3-1 / 2" (89mm), 4 dyfynbris GG; (102mm), dyfynbris 5 GG; (127mm), 6" (152mm), Bydd mesuriadau rhai modelau o lif twll wedi'u hargraffu ar wal y llafn torri.