The most comprehensive woodturners chuck package available. The package consists of: VIPER3R Geared Scroll Chuck with M33 x 3.5 Thread Standard Dovetail Jaws Pin Jaws Stepped Jaws Wide Jaws Face Plate 4 Prong Drive centre Wood Screw T Handle Square Drive T Handle Hex Key Aluminium Storage Case The Viper3 chuck is the best selling size from the Charnwood Viper range. A 4″ sized scroll chuck, with the jaws adjusted by a geared mechanism for simple one handed operation. Self centring, high precision design. Ideal for Midi sized lathes and upwards. The fully enclosed design prevents the build up of chips and dust inside the gear mechanism. For lathes with reverse direction, locking screws allow the chuck to be locked onto the lathe spindle, providing the lathe conforms to DIN800 or T38 design. Reverse direction should only be used when the chuck is mounted directly onto an M33 x 3.5 spindle thread. It should not be used in reverse when using a thread adapter. VIPER3RPACK Specification Direct Mounting Thread: M33 x 3.5 Chuck Body Diameter: 95mm Standard Jaws Expand from: 45mm to 80mm Standard Jaws Contract from: 67mm to 32mm Jaw Travel: 35mm Minimum Headstock Thread Length: 30mm Weight: 1900g THIS LATHE CHUCK MOUNTS DIRECTLY ONTO A LATHE WITH A SPINDLE THREAD SIZE OF M33 X 3.5. PLEASE CHECK THE SIZE OF YOUR LATHE SPINDLE BEFORE ORDERING. Optional thread adaptors are available to mount this chuck onto a lathe with a spindle thread size of : Thread Size / Part number 3/4" x 16tpi / VIPERID. 3/4" x 10tpi / VIPERIK. 1" x 8tpi / VIPERIA. 1" x 10tpi / VIPERIF. 1" x 12tpi / VIPERIG. 1.1/8" x 12tpi / VIPERIM. 1.1/4" x 8tpi / VIPERIE. M18 x 2.5mm / VIPERIH. M20 x 2.0mm / VIPERII. M25 x 2.0mm / VIPERIJ. M30 x 3.5mm / VIPERIN.