Precise, zinc plated, steel keys. Used for pulley and drive shaft applications. 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® 250 Piece Woodruff Key Asst contains: 10 – 1/16″ x 3/8″; 20 – 3/32″ x 3/8″; 10 – 1/8″ x 3/8″; 10 – 1/16″ x 1/2″; 20 – 3/32″ x 1/2″; 20 – 1/8″ x 1/2″; 10 – 3/32″ x 5/8″; 30 – 1/8″ x 5/8″; 40 – 5/32″ x 5/8″; 5 – 3/16″ x 5/8″; 20 – 1/8″ x 3/4″; 10 – 5/32″ x 3/4″; 20 – 3/16″ x 3/4″; 5 – 1/4″ x 3/4″; 5 – 5/32″ x 7/8″; 5 – 3/16″ x 7/8″; 5 – 7/32″ x 7/8″; and 5 – 1/4″ x 7/8″.