Custom Heavy Duty Hand Hole Covers are machined from 1/4" thick steel. The screw is counterbored into the cover for tamper resistance. A step is machined on the inside to prevent the cover from being moved. Penta Plus screws from Bryce F...
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Impressive
Pleasantly surprised to find the cover made out of single machined 1/4" thick piece of steel. Very durable construction. I assumed it would be thin sheet metal sandwiched together. Perfectly cut gasket fit exactly with good adhesive.