Email this pagePrint this page Sterile Blank Discs Go back to: Discs Quantity in Basket: none Product Code: 1512 Price: $9.99 Shipping Weight: 0.03 pounds Quantity: Sterile Blank Discs 50 discs, 1/4" diameter. Can be used to test a variety of antiseptics on bacteria in petri dishes. Soak a disc in an antiseptic and place it in an inoculated agar plate. Each disc will absorb exactly the same amount of liquid and leach the same amount of liquid into the agar.