The Killer Jig is a specially designed, professional quality jig made from lightweight machined aluminum with hardened bushings, a durable powder coated finish and easy to change backsets Comfortable knobs make it easy to adjust the jig to the thickness of the door for an accurate installation, every time, saving technicians valuable time and moneyspecially designed, professional quality Comfortable knobs make it easy to adjust the jig to the thickness of the door accurate installation