The SC4 is perfect for the demanding woodturner, being capable of holding large work pieces yet possessing the precision and compactness to handle more delicate work. This model features an enclosed back with full indexing plate and has pinions driven by a long ball ended hex key to make access easy, even when large work pieces are mounted. This chuck is an insert model (the relevant choice of insert is included in the price) which means it is easily future proofed against upgrades and can be used on multiple lathes, even if they have different spindle threads (additional optional inserts required). Supplied complete with the woodworm screw, 50 mm standard jaws and insert to suit virtually any lathe (including M33 x 3.5) this package offers professional performance at an exceptionally affordable price. Includes: SC4 Professional Geared Scroll Chuck 62313 50 mm Standard Jaw Set 62833 Standard Woodworm Screw 3326 8 mm Ball Hex Key 62825 SC4 Chuck Wrench Chuck Insert