The most comprehensive woodturners chuck package available. The package consists of:. . VIPER2 Geared Scroll Chuck with 1″ x 8tpi 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 Viper2 chuck is the smallest chuck from the Charnwood Viper range. A 2.75″ sized scroll chuck, with the jaws adjusted by a geared mechanism for simple one handed operation. Self centring, high precision design. Ideal for Mini sized lathes and upwards. The fully enclosed design prevents the build up of chips and dust inside the gear mechanism.. . The chuck fits directly onto lathes with headstock thread size 1″ x 8tpi. With optional adaptors available in 3/4″ x 16tpi and M33 x 3.5mm Specification. . Direct Mounting Thread 1″x 8tpi. Chuck Body Diameter 70mm. Standard Jaws Expand from 38mm to 62mm. Standard Jaws Contract from 54mm to 30mm. Jaw Travel 24mm. Thread Depth 30mm. Weight 1050g. Rating Hobby. THIS LATHE CHUCK MOUNTS DIRECTLY ONTO A LATHE WITH A SPINDLE THREAD SIZE OF 1" X 8TPI. PLEASE CHECK THE SIZE OF YOUR LATHE SPINDLE BEFORE ORERING. Optional thread adaptors are available to mount this chuck onto a lathe with a spindle thread size of : 3/4″ x 16tpi - Search for part number VIPERID. M33 x 3.5 - Search for part number VIPERIC.