Size of the set: the woodworking hinge hole drill bit is 80mm long, the size of the blue hinge hole locator is 66*77mm, and the hex key is 60mm long. Material of the set: the woodworking hinge drill is made of durable alloy. The blue hinge hole locator is made of plastic. Complete tools: The 3 tools included in the set are enough for installing hinges and other tasks. Scope of application: It can be used for electric drills, pistol drills, vertical electric drills, etc It is also suitable for carpentry or professional engineers. Product Features: Material of the set: The woodworking hinge drill is made of durable alloy. The blue hinge hole locator is made of plastic. Complete tools: the set contains 1 woodworking hinge hole drill bit, 1 blue 35 mm hinge hole locator and 1 Allen key. The 3 tools included in the set are enough to install the hinges and other tasks. Note: problem. About the size problem: the product may have 2-3mm deviation due to measurement techniques and angle issues. Regarding chromatic aberration issue: Due to different shooting angles or resolutions of color, there may be a little color difference.