Measure & Snap Your Chalk-line With One Comfortable Tool. Great For Layout On Floors, Roofs, & Framing. Free Battery for Built-in Light. Replaces Your Tape Measure & Chalk Line. Your Tool Belt Loses 1/2 lb & Clears Tool Box Space Too. Run Tape & Pop The Chalk Line Together. That's Not Possible With The Traditional 2 Bulky Tools. Comfortable Soft Rubber Pistol Grip Fits Small & Large Hands, Left Or Right. Buttons Well Placed Lighted Tape With 1/8ths Clearly Marked Means No Squinting, and No Flashlight In Those Dark Corners. Fits Standard Tape Measure Holsters. Or Steel Clip Snaps On Your Belt. Less Tool Box Clutter Too Ruggedly Built To Survive Job Sites. Rapid Recoil, While Pistol Grip Keeps Fingers Clear Of Blade