Drill Bits for Mushroom Spawn Jar Lids

Forstner style drill bits, available in three sizes, for drilling your own mushroom spawn jar lids. All of our Forstner drill bits are suitable for drilling through both metal and plastic mason jar lids. Perfect for the "Do It Yourself" enthusiast wanting to manufacture their own spawn jar myco lids! We recommend using these bits with a drill press for the most accurate results.

Available in three sizes, each with different recommended applications:

• 3/8" Inch: Appropriately sized for our 29 mm synthetic filter discs and our 20 mm adhesive filter disc stickers.
• 1/2" Inch: The perfect size for our super heavy duty injection ports and our 25 mm adhesive filter disc stickers.
• 3/4" Inch: Appropriately sized for our 35 mm adhesive filter disc stickers.

Drill bits are also available for mushroom liquid culture jar lids.