Southco Tubular head styles are used to add a level of security for E3 compression latches compared to the normal tool access type of recess. Tubular Key heads can be identified by a deep circular recess in the face of the latch similar to the image shown.
Large E3 latches have a head diameter of 29.0 millimeters and a body which is 19.0 millimeters across flats.
Steel key with Nickel plating
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