The KNAPP®️ Forstner Bit comes in 30 mm and 35 mm. It has a custom adjustable depth gauge that is specially designed to drill the perfect depth of the hole for the UNO 30 and DUO 30 and 35 Hook Connectors. The tungsten carbide tipped blade is coated to ensure optimal protection for long-lasting performance. All of our KNAPP® router bits are made in Austria because we strive to serve you with the highest quality products.