The original “Jiffy” chuck from this company has undergone improvements. The manufacturing process has been upgraded to meet ISO: 9000 quality-control standards. This upgrade provides a new industrial tool-grade finish, ensuring “wobble-free” driving of sheet metal screws and other hex-headed screw products.

Shook Manufactured Products Inc., 1017 Kenmore Blvd., P.O. Box 15058, Akron, OH 44314; (800) 354-9792; fax: (800) 733-3882;