"I've used these on solid timber and find them reliable and easy to use provided the correct size hole is drilled. To prevent any breakout I usually countersink the hole slightly which also means the head is flush with the timber."
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Review 3 for Insert Nuts Type D M6 x 20mm Pack of 50
"Found this to be an eay to use insert nut provided the correct size pilot hole is drilled first. There can be a bit of break away around the hole as the nut bites into man-made boards. Correctly inserted it has good holding power."