Patented Twin-Core Technology: An advanced metal dual return spring allows for a reduction in overall size while retaining maximum strength and performance. Easy-To-Use Lock: Engages and disengages with ease, holds strong when locked. Compact and Ergonomic Case: Improved case design with a flat bottom for increased stability without tipping over. Large Belt Clip: A new screw-free belt clip design for a stronger hold. Lanyard Slot: Reduces the risk of dropping when working at height | Stanley FATMAX 8M Next Gen Tape Measure