Holds 10 Coverslips ?Fast & easy cleaning, surface-treating and drying.? Holds all slipcover sizes including 18, 22 and 25 mm. Durable and Hassle Free One piece polypropylene rack does not require assembly and is chemically and thermally resistant.? Autoclavable. Secure Innovative design includes a notch to secure coverslips with a rubber band or loop of monofilament. Compatible Fits inside a 100 mL beaker with space underneath for a small stir bar when submerged. Economical Available at a fraction of the cost of PTFE products.