Flange Wizard Threaded two hole pin is made of alloy steel that offers enhanced durability and strength. Pin is ideal for flanges that have 1/2" - 1 7/16" Dia holes..One pin that has a 360 deg vial for easier vertical leveling that just snap in and out for easy replacement.Up to 2 1/2 in thick flange.For flanges with holes 1/2 to 1-7/16 in diameter.Threaded models have fast double lead threads.Material: Alloy steel.Extensions available for threaded models to accommodate thicker flanges: #0501 2 7/8 in stud, #0503 4 1/2 in stud, #503-EX coupling.One pin that has a 360 deg vial for easier vertical leveling that just “snap” in and out for easy replacement.Two hole pin all models are machine from steel to make a very sturdy and lasting tool, For Flanges With Holes 1/2 To 1-7/16 in (Dia).Make your welding tasks easier with this Flange Wizard alloy-steel threaded two-hole pin. Both pins on each sturdy piece have double-lead threads, so you can apply the unit quickly and increase your productivity. Use this item with flanges up to 2.5 inches thick. One of the pins on each piece is equipped with a convenient 360-degree bubble level.