SmartPro Tools SPT 4500-B Precision Extendible Shaft 12-in-1 Screwdriver Set Precision screwdriver allows you to work in tight spaces or with screws requiring a precision bit. Screwdriver shaft is extendible an additional 2-3/8" and can be locked in both the closed or extended position in any incremental length. Comes complete with 6 double-ended bits, a total of 12 bits. 5 double-ended bits store in the handle and are easily accessed. Convenient pocket clip.