Click to expand Tap to zoom Benchmark BSW13 Block (20 x 12mm or 13mm Test Tubes) by Benchmark Scientific Save $-97.75 $97.75 | / SKU BSW13 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart Block, 20 x 12mm or 13mm test tubesBlock, 20 x 12mm or 13mm test tubes