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Cabirka u dhigma ee gaarka ah waa sida soo socota:
An4: dhexroorka gudaha = 5.56mm, dhexroorka dibadda = 11.18mm;
An6: dhexroorka gudaha = 8.7mm, dhexroorka dibadda = 13.97mm;
An8: dhexroorka gudaha = 11.11mm, dhexroorka dibadda = 16.26mm;
An10: dhexroorka gudaha = 14.2mm, dhexroorka dibadda = 20.32mm;
An12: dhexroorka gudaha = 17.46mm, dhexroorka dibadda = 23.50mm;
An16: dhexroorka gudaha = 22.23mm
Fiiro gaar ah: sababtoo ah tubbada gudaha waa tuubo caag ah oo NBR ah iyo laastikada, waa caadi in xogta la cabbiray ay yeelato dulqaad gaar ah
Faahfaahinta ka eeg aqoonsiga tiirka shaxdan soo socda (cutubka aqoonsiga tiirku waa inji, haddii loo rogo nidaamka metric, waxay u baahan tahay * 25.4mm, taas oo ah xogta mitirka ee kore)