Quickly adjustable for all types of flanges or pipe sizes ranging from 3” to 12” diameter ,Made of durable and lightweight aluminium ,Inserts easily into pipe, centers snugly against the inside pipe diameter and automatically aligns with the pipe axis. ,Aids in fast, accurate pipe construction with self-determining flange aligning tool. ,Features slotted pins with “friction fitting” knurled nuts for flanges to 30” – 150 lbs