Stainless steel lacing anchors are available sizes of 2.5inch and 4.5 inch and gauges of steel is 12gague and 14 gugue.  lacing anchors are essentially large nails with hooked heads. Lacing anchors are used to secure insulation to the areas it insulates. During installation, an anchor  pins is pushed through the front of an insulation blanket or board so that the hooked head is snug against it.

lacing anchors are widely used in insulation blankets,covers and pads, work with 25mm or 38mm self locking washers. material in stainless steel, diameter pins is 14ga and 12ga.