1. High precision: This jig has high precision and the guide hole is made of a steel drill sleeve, so you don't have to worry about the drill being worn out when drilling and losing accuracy. 2. Four sizes: There are four hole sizes, 3/8 inch, 5/16 inch, 1/4 inch and 3/16 inch, which you can use in different situations. 3. V-shaped slot and N-shaped slot: Our jig has a V-shaped slot for drilling holes in angular and cylindrical faces, and an N-shaped slot for precise location of the hole to be drilled. 4. Lightweight: Our drill guide jig is lightweight and very easy to carry, you can take it with you anywhere to use it. 5. Aluminum Alloy Material: The drill guide jig is made of aluminum alloy, high hardness, strong and wear-resistant, anodized finish, corrosion resistance.