OS-NBR-2-3/4×3-1/2×3/8
OS-NBR-3×3-3/4×3/8
OS-NBR-3×4×3/8
OS-NBR-3-1/4×4×3/8
OS-NBR-3-1/4×4-1/4×3/8
OS-NBR-3-1/2×4-3/8×3/8