DF52-14S-0.8H(21) DF52-15P-0.8C DF52-15S-0.8H(21) DF52-16P-0.8C DF52-16S-0.8H(21) DF52-17P-0.8C DF52-17S-0.8H(21) DF52-20P-0.8C DF52-20S-0.8H DF52-20S-0.8H(21)