Polycarbonate Benchtop Cryogenic Tube Holder has anti-rotation feature for one handed capping and decapping. Blue polycarbonate 25-place rack (5030-0505) allows single-handed vial manipulation. Spacing around each hole is greater than in C6530-2 (5030-0510) to grasp vials easily. Bottom of each well interlocks with base of vial. Accepts all NALGENE cryogenic vials, except C6524-1. Holes are staggered for viewing vial contents. White polycarbonate rack (C6530-2) accommodates up to 50 vials in a 5 x 10 array. Bottom of each well interlocks with base of vial.