The Ultra Stone-Damage Windshield Repair Kit has all of Ultra Bond's and Richard Campfield's proprietary (patented or patent pending) stone-damage/chip repair technology including: the Star Flexor, Clear Pit pit filler, Hybrid Chip Repair resin, Xtra Bond, X-Phobic, Rain Proof additive and the Edgeguard crack resistant windshield coating. This kit has more stone-damage windshield repair technology than any other kit on the market, which means your repairs are the best in the business and you are prepared for whatever mother nature throws at you. The Crackmaster injector is like a semi-automatic gun and can do 8 repairs without reloading which is faster and less work than using multiple tools when you have more than one repair to do. Tools that have to be reloaded after every repair are not an efficent use of time requiring more cleaning, set-up and break down. EXAMPLE COMPARISON- One shot tools like a bolt-action single-shot gun you have to pull out the bolt (piston) retreive the bullets (resin) place the bullet in the chamber (drop the resin into the chamber) close the bolt (insert the piston) put the bullets away (put the resin cap back on and get it out of the sun). With the Ultra Bond Crackmaster Injector you just load it once in the morning and go from one break to another like pulling the trigger of a semi-automatic gun AND when it comes to cleaning you only have one gun to clean.