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M3 Heat-Set Glue-In Corner Boss Four-Pack
This is a snap-off set of four 13 x 13 mm corner bosses that add M3 screw-down lids to any square-cornered project box, food tub or old enclosure that has no screw posts. You glue each boss into a corner at whatever height suits your lid. Each one has a 4.0 mm bore that takes an M3 brass heat-set insert, and a 3.4 mm clearance hole continues 16 mm deep so longer screws fit. The undersides taper at 45° so no floor ledge is needed, and a 2.5 mm relief clears rounded inside corners. The lid screw sits 6.5 mm in from each wall.
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