About This

• Multi-Purpose Inspection Tool: Quickly checks hole sizes (0.061"-0.250"), slot widths, keyways, and V-groove alignment. Perfect for verifying drill/chuck runout, dovetail slots, and calibrating calipers or micrometers.
• Simple Go/No-Go Testing: Go-End, (0.2500"-0.2502") should slide in easily - if not, hole is too small (can be reworked). No-Go-End, (0.2548"-0.2550") must not enter - if it does, hole is too large (scrap part).
• Heavy-Duty Workshop Construction: Made of hardened bearing steel (60-62 HRC) with ultra-smooth finish (≤10μm) for consistent, repeatable measurements that stand up to tough shop conditions.
• Precision Engineering: Maintains tight ±0.0002" tolerances and ±0.01" stability across the full 2" measuring length. Laser-etched sizes stay visible even with heavy use.
• Smart Storage & Protection: Foam-lined aluminum case keeps gages organized and prevents damage - always ready when needed.
• For Machinists & QC Inspectors: Essential for checking hole position, gear grooves, milling cutter alignment, and verifying part wear patterns in production environments. Note: For best results, clean parts and gauges before use. Measurements should be taken at standard room temperature (68°F/20°C).