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Test tube rack "13x31": Plastic, 31-place, for 10 to 12 mm test tubes. Three-tier design prevents tubes from sliding out the sides. These racks are polypropylene, which makes them:
Ship wt. 0.6 lb. #C1331... $10.99 each ..............................................................................................................................
"15x18" For 13-15 mm tubes (15's may fit snugly). Three rows of 6 holes each, 15+ mm dia. No drying pegs. #C1518....$7.49 each ..............................................................................................................................
"18x12" For 15-18 mm tubes (18's may fit snugly). Two rows of 6 holes each, 18+ mm dia. No drying pegs. #C1812....$7.49 each
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