The SnapBack Releasable Tip allows the user to walk half the steps by never crossing a workspace again to retrieve a chalk line tip. Constructed of high quality stainless steel and durable polypropylene, the double fanged teeth design locks in place and doesn't move until you release it. Invert the tip for non-edge use, also includes an advanced center point mark indicator. Compatible with all hand-held chalk lines. It snaps back so you don't walk back!