Set Size: The wood hinge hole drill bit is 80mm long, the size of the blue hinge hole locator is 66x77mm and the hex key is 60mm long. alloy. The blue hinge hole locator is made of plastic. Complete tools: The 3 tools included in the set are sufficient for installing hinges and other tasks. Scope: It can be used for electric drills, pistol drills, vertical electric drills, etc. It is also suitable for professional carpentry or engineers. Product Features: Set Material: The woodworking hinge drill is made of durable alloy. The blue hinge hole locator is made of plastic. Complete Tools: The kit contains 1 woodworking hinge hole drill bit, 1 blue 35mm hinge hole locator and 1 allen wrench. The 3 tools included in the set are enough to install hinges and other tasks. Note: problem. About size problem: The product may have 2-3mm deviation due to measurement techniques and angle problems. Regarding the problem of chromatic aberration: Due to different shooting angles or color resolutions, there may be a little color difference.