These blades were developed in collaboration with the faculty and staff at James Krenov's Fine-Woodworking studio here in Fort Bragg. 3/16" thick, they won't deflect or chatter under the toughest use. Designed specifically for the finely-tuned handmade wooden plane, these irons are un-beatable. Bevel is 30°. They come complete with chip-breaker and assembly screw. High carbon steel. 1-1/4" wide x 3-1/2" long.