The 12D, sometimes referred to as the 12B in the US market, is a double edged No. 12 blade sharpened along both sides of the crescent shaped curve. It is used extensively within Dental surgery techniques and fits Handles 3, 3L, 3 Graduated, 5B, 7, 9, B3 and B3L. Box of 100

These blades cut clean and stay consistently sharp. They are designed with a unique cutting edge that combines a micro-serrated edge with a razor edge. 

This unique feature provides the user with a tactile sensitivity improving depth control, while also creating equal, smooth tissue margins. As a result you use less blades per procedure and save money in the process.