Releases tension on serpentine belts with a spring loaded idler pulley. Ratcheting head with freewheel position allows maximumleverage. Set ratcheting head to the middle or neutral/freewheelposition and once ximum travel point is reached simplyclick lever into place to lock the ratchet mechanism. Comeswith extension for hard-to-reach idler pulleys. This tool will work where conventional ratchets or breaker bars won't fit due to limited access. Now includes 19mm socket for Honda and Toyota applications. 57390 14mm Socket 57440 15mm Socket 57450 18mm Socket 57500 13mm Socket 57530 3/8\" Square Drive 57560 1/2\" Square Drive 57580 16mm Socket 59100 Extension 59140 19mm Socket 59190 Handle Assembly *Ratchet 5/8\" *17 1/2\" handle length *57520- SOCKETS AND HOLDER AS A SET