Safety rope for measuring tapes Features For Attached Tool Weights: up to 20 oz ( 567 g ) Standard Overall Length: 16.5 in ( 420 mm ) (max, including halter snap) Extended Length: 59.1 in ( 1,500 mm ) (including halter snap) Rope Tether Diameter: 0.1 in ( 3.2 mm ) (polyurethane resin) Core Diameter: 0.03 in ( 0.8 mm ) (Vectran*) *Vectran is a registered trademark of Kuraray Co. Ltd.