HSB - Carbide Burs FG - #1/4 - 100/PkRound burs aid in initiating and contouring cavity preparations effectively. They are valuable for facilitating root canal access and caries elimination. Smaller dimensions make them ideal for supporting conservative preparation techniques. House Brand Carbide Burs have outstanding cutting performance with a wide array of shapes and sizes in common configurations that cater to a wide range of clinical requirements.