Made of lightweight cast aluminum, non-magnetic, can be used on PVC pipe. Contains an adjustable DSL in protective housing (protects from weld splatter and breakage). Fitted with self-aligning conical spacer and conical nut and bolt units. One stationary nut / bolt, other slides up to 5.5 inches1 Jackson Safety #20 Dual-Angle Flange Level / Order For nearly a century, professional workers in all walks of life have demanded Jackson Safety for their welding and personal protective equipment needs. The reason is simple. When it comes to providing innovative safety solutions, unparalleled features, long-lasting value, and comfort, Jackson Safety has set the standard.