Jackson Safety Multi-Trammel Heads comes included with an allen wrench, soapstone and scribe, with screws squared on back for perpendicular alignment. 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 bar. Equipped with 1/4" screws, the stationary head holds 1/4" in case hardened center points. Established in 1933, Jackson Safety has built a century long reputation for delivering the most innovative safety solutions in the welding and personal protective equipment industries. When it comes to providing safety solutions with long-lasting value, durability and comfort, Jackson Safety has set the standard. Whether the need is for welding protection in a steel fabrication environment, head protection on a construction site, or hearing protection at an airport, Jackson Safety provides the widest range of safety choices to meet the needs of every job and every worker.