The Supernova 2 patented gearing system delivers incredible gripping power and is over a third faster than the original SuperNova. With SuperNova2 gripping power you'll find yourself turning longer, more delicate stems. Large, rough and uneven work that you couldn't handle before can now be turned with greater security. The SuperNova2 requires only one hand to operate using a ball nosed Allen key with a large easy grip handle (included). It's quick to tighten and requires much less effort. The ball nose allows the handle to operate at an angle while tightening the chuck. The SuperNova2 has a fully sealed heavy duty backing plate made from Duracon 25 composite which is reinforced with stranded glass fiber. Backing plate design incorporates a 24 division index for future indexing accessories. All of the original Nova Chuck accessories, jaws and inserts are 100% compatible with the SuperNova2! The unique and user friendly features of this chuck prove it was designed by and for woodturners. Diameter of chuck is 3-7/8", depth is 3-3/8", weight 5-1/2 lb. Includes 50mm jaw set, T-bar, Allen wrenches, and manual. Included - ILNS 1" x 8tpi Insert to fit 1-1/4" x 8tpi spindles