Precise, stainless steel keys. Used for pulley and drive shaft applications where corrosion resistance is a factor. Handy kit for shop toolroom or toolbox. On hand when needed saves time and money. Plastic compartment box is easy to store. The Precision Brand® 66 Piece Stainless Steel Woodruff Key Asst contains: 5 each 1/16″ x 3/8″, 3/32″ x 3/8″, 1/8″ x 3/8″, 1/16″ x 1/2″, 3/32″ x 1/2″, and 1/8″ x 1/2″; 4 each 1/8″ x 5/8″, 5/32″ x 5/8″, 3/16″ x 5/8″, 1/8″ x 3/4″, 5/32″ x 3/4″, 3/16″ x 3/4″, and 1/4″ x 3/4″; 3 each 3/16″ x 7/8″ and 1/4″ x 7/8″; and 2 each 1/4″ x 1″.