Hello,

Altec & Woodchuck Brush Chipper Knives. Made after 2000..you get 4 knives

Part # 100-ro40208

Model: wc19

8-3/8 x 4 x 1/2 with 3 holes..THESE WILL ONLY FIT IN CHIPPERS MADE AFTER THE YEAR 2000 

If you need knives made before 2000 see eBay item number:300394033893

Any question call us 435 673-9707

thanks