INSIZE 4267-513 Steel Pin Gauge Set (High Accuracy) 15.0–20.0 mm

This INSIZE 4267-513 set holds 51 steel pin gauges running from 15.0 mm to 20.0 mm in 0.1 mm steps. Each pin meets DIN 2269, grade 0 and holds ±0.5 µm diameter accuracy, machined from alloy steel and hardened to HRC62-65, per INSIZE's specification. At 50 mm long per pin, the set is packed in a lined wooden storage case. A set like this is used to check drilled or bored hole sizes: the pins are tried in turn until the right fit is found, giving a direct reading of the hole's diameter.