3 piece set. These grommet dies work with the Osborne W-1 hand machine. Grommet size: #4. Hole diameter: 9/16 . - Spur Grommet Die & Cutter #4///brand_for_product_detail=C.S. Osborne,close_out=No,companydescription=C.S. Osborne - Made in the USA,condition=New,condition_google=new,cost=49.260000,countrymade=Made in the USA,featured=0,identifier_exists=0,instock=in stock,manufacture_country=United States,product_image_size=Default,product_page_type=Default,shopping_ad_bestseller=No,smart_campaign_bestsellers=Rest of Smart Campaign Products,square_product_image=0,square_updated_at=0,sw_featured=No,url_path=spur-grommet-die-cutter-4