The BVTS is available in 21 (0.83"), 31 (1.22"), 40 (1.57"), 52 (2"), 65 (2.56") and 78 mm (3.07") heights.

For penetrating only sheet insulation (i.e., fastening onto plywood sheathing, concrete block, concrete or clay brick), order the BVTS size to be the thickness of the insulation. For penetrating gypsum sheathing and sheet insulation, add the thickness of the gypsum sheathing to the thickness of the insulation and order the BVTS size to be the sum of the two.