Jackson Safety Multi-Trammel Heads (Includes: Allen Wrench, Soapstone, Scribe), 14785FEATURES – Jackson Safety multi-trammel deads comes included with an allen wrench, soapstone and scribe, with screws squared on back for perpendicular alignmentDESIGN – These tools feature radius set points, cast-in alignment and a marking pointer for easy setting; 1-½ circle marks to any diameter needed, depending on the length of tube used as a compass barMEASURES – Equipped with 1/4" screws, the stationary head holds 1/4" in case hardened center points