CR503S - Chalk-Rite® Dura II Extreme Bold 100ftExtra heavy duty chalk box with new Extreme Bold Snap Line which holds double amount of chalk comparing to Extra Bold Snap Line is suitable for fieldsworks which require continuous snaps. New canister fill cap enables felt replacements. SPECIFICATIONS: Premium braided snap line creates Extreme Bold 0. 07 in ( 1. 8 mm ) linesHolds 2x more chalk than the Extra Bold Snap Line marking toolsHeavy duty aluminum case integrated with non slip grip