B-Lok Set-Up Tray Flat Size B (Ritter), Midnight Blue, 13-3/8" x 9-5/8" x 7/8". The tray has wide edges and non-slip feet for stability. Autoclavable up to 136C or 277F. Flat Tray. Midnight Blue. B-Lok. Classic. Wide easy to grip edges and non-slip feet for stability. Self-lubricating, high-gloss surface that helps prevent staining.