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"Trilock style plug gages are a style for large sizes. The trilock handle has three prongs on the ends which fit into three grooves equally spaced around the central hole of the gage members. A bolt holds the member to the handle and the trilock grooves and prongs stabilize the gage member."
<https://willrich.com/shop/cmm-sensors-probes-styli/zeiss-2/datum-products-for-zeiss/>