Multifunctional Guitar String Winder for Bass Acoustic . A heavy duty and compact string winder. Removable bit for use in cordless drill and powered screwdrivers. Can loosen and tighten strings by unwinding and winding at the tuning pegs. Fits most common sized tuning pegs. Unlike most manual stringwinders this tool has a drill bit attachement making string changing a breeze. The winder also has an extra slot that makes removing pegs from of an acoustic guitar easy. Suitable for Guitar, Bass, Banjo, Dobro, Mandolin, Ukulele, and More. Use:Metal Drilling Type:Core Drill Bit Colour:Black Material:ABS+Metal Package Contents: 1 * Guitar String Winder Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.