SteriBest Trays - Autoclave Instrument Trays for Sterilization Available in 8 sizes, the largest of which includes an Insert Tray & Insert Mat to store and protect more instruments at a time. Surgical Instrument Trays. Enhanced Features: -Extra slots mean increased steam penetration and more rapid drying -Raised node base surface and slotted lid facilitate circulation of steam and aid in drying -Helps eliminated wet pack