Husqvarna Vari-Drill B30 Core Bits Husqvarna's Vari-Drill B30 Series core bits are engineered to drill through hard concrete with medium to high steel reinforcement. Features Longer life core bit for medium to hard concrete with medium to high steel reinforcement Straight diamond segments 2" - 8" core bits have laser-welded bond 9" and over core bits have brazed bond 14" drilling depth 1-1/4"-7 threaded attachment 0.4" diamond segment height These core bits are designed for wet drilling only Material Performance Hard Concrete Excellent Reinforced Concrete Excellent Abrasive Material Not Recommended Natural Stone Not Recommended Brick and Block Not Recommended