The Wood Magnet is a cutting-edge tool developed for professional framing carpenters and skilled craftsmen. The compress fits onto any 2X material (2x4, 2x6, 2x8, etc.). Use with posts and pipes up to 4 in.in diameter or level studs and joists. Will Not fall off any leveling material. Use on a long stud for a quick 8 ft. level or more! Has ABS hi-impact body, cushioned rubber grip and three easy-to-read vials.