Komelon's Self-Lock Power Blade II is specifically designed to provide the wider blade and added standout desired by industry professionals. Our self-lock feature allows you to extend the blade and leave it locked at extension, then to release the tape back into the case you simply use the thumb push button to return the blade into the case. In addition, this tape comes equipped with large read numbers and backside printing for easy measuring. This tape has a high visibility blade which sets it apart from the competition.