Set of 8 replacement screws for attaching the jaws to our VIPER2 scroll chuck.Thread Size: M4 Overall Length: 12mm The chuck fits directly onto lathes with headstock thread size 1″ x 8tpi. Set of 8 replacement screws for attaching the jaws to our VIPER2 Lathe Chuck., Screw Size: M4., Overall Length: 12mm. The fully enclosed design prevents the build up of chips and dust inside the gear mechanism. Replacement Lathe Chuck Screws Warrior - Jaw Fixing Screws X8 For Viper2 Lathe Chuck - Warrior M4 12mm Lathe Screws Set of 8 replacement screws for attaching the jaws to our VIPER2 Lathe Chuck. Screw Size: M4. Overall Length: 12mm. Viper2 lathe chuck is ideal for Mini sized lathes and upwards. The Viper2 chuck fits directly onto lathes with headstock thread size 1″ x 8tpi Viper2 lathe chuck is ideal for Mini sized lathes and upwards. Self centring, high precision design. Viper2 chuck spare jaw screws (set of 8 The Viper2 chuck fits directly onto lathes with headstock thread size 1″ x 8tpi.