The Jackson Safety Contour Dial-Set-Level is an adjustable bubble protractor used with a number of the popular Jackson Safety Curv-O-Mark pipe measuring tools, including models #4, #6, #7, #8, #20 and #33 (all sold separately). The protractor covers 180 degrees through two 90 degree quadrants, reading in 2.5 degree increments. The bubble is cast in lightweight aluminum dial for durability. 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. DIAL SET LEVEL DSL - Jackson Safety Replacement DSL is an adjustable bubble protractor used with popular Curv-O-Mark pipe measuring tools, including models #4, #6, #7, #8, #20 and #33 (sold separately) 180 DEGREE COVERAGE - Covers 180 degrees through two 90 degree quadrants READS - In 2.5 degree increments LIGHTWEIGHT DURABLE - Lightweight cast aluminum dial for durability REPLACEMENT PART - Replacement part for Jackson Safety's Pipe Marker 14775 14776 (sold separately)