Material and durability Material: quality metal for long service life Measurement accuracy and design Precise construction for quick and easy measurement The hole taper ruler is fully tapered along its length for fast and reliable measurement in professional environments Simple structure and reasonable design Measurement capability Measures holes with an accuracy of 0.1 mm, ideal for fine work across a variety of applications Use scenarios Metal fabrication and machining: verify hole sizes during drilling, reaming, or finishing to ensure proper fit and tolerance Component assembly and inspection: check hole diameters and taper to ensure correct mating with pins, bushings, or inserts Quality control in workshops: routinely inspect hole tolerances in tools, dies, and mechanical parts to maintain consistent performance