Jackson Safety 14779 Curv-O-Mark #10 Pipe Flange AlignerAids in fast, accurate pipe construction with self-determining flange aligning toolQuickly adjustable for all types of flanges or pipe sizes ranging from 3 to 12 in diameterInserts easily into pipe, centers snugly against the inside pipe diameter and automatically aligns with the pipe axisFeatures slotted pins with "friction fitting" knurled nuts for flanges to 30" - 150 lbs.Made of durable, lightweight aluminum