Plastic Test Tube Rack for 15/18 mm Tubes, Hole Diameter is 18.7mm, Holds 50, Detachable, Karter Scientific 208U7 (Pack of 10) 15/18mm Pack of 10 hidden 000 mcg – For adults

000 mcg – For adults deficient in biotin

Comfortable and wide contact area provide stable support for easier transfer

Red/black N/S lines in capsule ensure easy and safe settling

3/32" shaft

and reduced muscle fatigue during daily activities

Plastic Test Tube Rack for 15/18 mm Tubes, Hole Diameter is 18.7mm, Holds 50, Detachable, Karter Scientific 208U7 (Pack of 10) 15/18mm Pack of 10 hidden 000 mcg – For adultsPlastic Test Tube Rack for 15 18 mm Tubes, Hole Diameter is 18. 7mm, Holds 50, Detachable, Karter Scientific 208U7 (Pack of 10) 50 Place Test tube rack for 15 18mm diam. Tubes, detachable, plastic, Color is CLEAR. Test tube rack is manufactured to hold 50 tubes having an outside diameter ranging from 15 18mm. Great to hold tubes for parties, lip balm kits, essential oil preparation, etc. Product Features 50 hole,Diameter: 18. 7mm 0. 74" These are