This revolutionary Komelon tape measure functions like they always should have. With Komelon s Self-Lock tape measures all you have to do is pull the blade out let it go and the blade remains locked! To safely retract the blade simple press the top button and control the blade retraction speed. This tape measure also has a ergonomic case design that fits comfortably in your hand. The blade is also coated in a thick nylon coating to protect the blade and provide maximum durability.