Feature: 1. Diamond drilling bit come with fast drilling speed, round hole without gap 2. Using high quality diamond material blade, which is of sharpness and durable 3. Oval chip drain hole designs, more conducive to chip discharge, efficient and bring small cutting resistance 4. Can be used for a variety of equipment such as electric hand drills and bench drills 5. The product come with stable structure and excellent performance, practical and convenient Specification: Item Type: Diamond Hole Saw Material: Diamond Process: Brazing Hole Diameter: Approx. 40mm / 1.6in Handle Diameter: Approx. 16mm / 0.6in Color: Golden Applicable Equipment: Electric hand drill, bench drill Package List: 1 x Diamond Hole Saw