Sherline 4 Jaw Chuck SELF-CENTERING CHUCK, P/N 1075 This chuck combines the ease-of-use advantages of the 3-jaw chuck with some of the advantages of a 4-jaw chuck. It will automatically center square or round stock.
(The stock must be accurately shaped for all four jaws to grip.) It will also grip thin-wall tubing in four places rather than three, which spreads out the load and allows more grip without crushing the tubing.
1075 Sherline 2.5" Self-Centering 4-Jaw Chuck Instructions
CA Prop 65 WARNING: Drilling, sawing, sanding or machining wood products can expose you to wood dust, a substance known to the State of California to cause cancer. Avoid inhaling wood dust or use dust mask or other safeguards for personal protection.
I can do all this through him who gives me strength. Philippians 4:13