Stainless steel.

Retainers hold each box securely but separately and allow fast retrieval of one box and immediate return to rack.

Vertical
479-3351, 479-3352: for cryoboxes with 5×5 cryotubes
212-8117, 212-8118: for standard cryoboxes
479-3356, 479-3357: for cryoboxes with 5 ml tubes and Mr. Frosty

Horizontal
Fit most upright freezer compartments
For standard cryoboxes of 133×133×51 mm
With two lateral handles