Includes 20" removable universal extension for fastening while standingSteel feed mechanism for durabilityHandle #6 to #12 screws 1" to 3" in length with a single nose pieceReversible screw belt feeds from either endOpen nose for precise placement of screwsOne-piece bit is stronger, more convenient that mandrel designsKeyless bit changes fast, positive and preciseUnique, simple system provides the most consistent countersink in the industryFast, precise and repeatable depth control. Simply rotate convenient adjusting ring, each click changes depth 1/64"Tool can be used as a conventional power screwdriver without the feed mechanismFast, convenient and versatile