The 66-piece stainless steel Woodruff key assortment includes Woodruff keys in various sizes and comes in a compartmented plastic case for storage and organization. They are designed for pulleys and drive shaft applications and are made from stainless steel, which offers corrosion resistance. The material may be magnetic. Machine keys secure rotating machine components to a shaft and transmit torque from the shaft to the hub or other shaft-supported components. Keys have a square, rectangle, tapered, or Woodruff shape. Tapered keys are suitable for hub adjustment. Woodruff keys are rounded for relief of stress on the shaft during high speed applications.What's in the Box?(5) 1/16" x 3/8" Woodruff keys(5) 3/32" x 3/8" Woodruff keys(5) 1/8" x 3/8" Woodruff keys(5) 1/16" x 1/2" Woodruff keys(5) 3/32" x 1/2" Woodruff keys(5) 1/8" x 1/2" Woodruff keys(4) 1/8" x 5/8" Woodruff keys(4) 5/32" x 5/8" Woodruff keys(4) 3/16" x 5/8" Woodruff keys(4) 1/8" x 3/4" Woodruff keys(4) 5/32" x 3/4" Woodruff keys(4) 3/16" x 3/4" Woodruff keys(4) 1/4" x 3/4" Woodruff keys(3) 3/16" x 7/8" Woodruff keys(3) 1/4" x 7/8" Woodruff keys(2) 1/4" x 1" Woodruff keys(1) plastic case