Specifications: Material: Aluminum Alloy & Plastic (Black part is plastic). Size: 11*3.7*8.6inch (28*9.5*22cm). Color: As shown. Package Includes: 1 X Drilling Locator (Excluding Electric Drills and Drill Bit). Features: Easy to Drill: Makes wood drilling easier, straighter and more accurate; compatible with cordless and corded drills and impact drivers via 1/4 inch hex shaft. Multi-Directional Use: Fence connects to any square base of 4 sides, usable in multiple directions and as board edge. Built-in Hexagonal Drill Bit: Two center pins stored when not in use, screwed into base bottom and tightened with column cap (built-in hex bit). Maximum Size: Drill bit capacity up to 1 inch; remove and flip to install up to 2 inches. V-shaped groove for centering logs like round pins. Complete Accessories: Key chuck, conical depth control shaft, limit ring, spring return, reversible chuck bracket, built-in V-groove, centering and adjustable fence. How to Drill: 1. Adjust drilling height according to board thickness. 2. Tighten clamp to fix drill guide on wooden board. 3. Place step drill bit into pilot hole. 4. Turn on electric drill and set speed to 500-1500rpm. 5. Drill slowly before half step drill bit into wood to improve accuracy.