... unit(mm)1/4"×1/4"6.4×6.422,23,243/8"×3/8"10.6×10.619,20,21 ... ×12.716,17,18,19,20,21,22,235/8"×5/8"16×1618,19,20,213/4"×3/4"19 ... .1×19.116,17,18,19,20,211"×1/2"25.4×12.716,17,18,19,20,211-1/2 ... -1/2"38×3814,15,16,17,18,191"×2"25.4×50.814,15,162"×2"50.8×50.812 ...