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Engine blocks and transmission cases contain deep, small-diameter bores for oil galleries and bolt holes. A standard 30mm stylus cannot reach the bottom datum. The SW Finder 52 Top slides past the counterbore and touches the critical sealing surface without the need for a stepped stylus array.

Unlike cheap edge finders that break at 500 RPM, the SW Finder 52 Top is rated for . Start at 800 RPM for general use. Note: Do not exceed 2,000 RPM or the spring mechanism will disengage permanently.