PRO-LOK decided to design their new Killer Jig for many reasons. According to them, they felt that a professional high quality jig was needed that was both light in actual weight while maintaining the high quality that professional installers expect. Also, versatility and speed were important qualities that they wanted to incorporate into their design. As a result, PRO-LOK is proud of their latest addition to our installation tool line of products. It's hard to decide which features or benefits to cover: Quality Construction of the jig made from machine aluminum with hardened bushings and a durable powder coating finish; easy to change backsets, versatility and ease of boring different size holes; soft rubber pads to protect the door, large comfortable knobs; quick change adapter which saves time when changing bits, heavy duty latch and strike plate markers; strike locator and spur bits all combined in a heavy duty custom carrying case.Best results, accuracy & most of all efficiency with our New Lock Boring Installation Jig... Always! Kit includes: Killer Jig, both 2-1/8" & 1-1/2" cross-bore spur bits, 1" edge-bore bit, strike locator, 4 different heavy duty latch and faceplate mortise tools, unique deadbolt height gauge and custom molded carrying case.