Works on steel, brass, aluminum, plastic, wood and other materials. 1/4" round shank. This high speed countersink has a 7 flute rose pattern for chatter free countersinking on steel, brass, aluminum, plastic, wood, and other materials. It is made of high-speed steel with seven flutes. 82 degree point angle. It has a 1/4 round shank in size 3/4 . - General Tools 195-3/4 3/4-Inch Countersink Bit///brand_for_product_detail=General,close_out=No,companydescription=General - Imported,condition=New,condition_google=new,cost=3.340000,countrymade=Imported,country_flag=no_selection,featured=0,flag=no_selection,gtin_google=038728230508,identifier_exists=0,instock=in stock,is_recurring=0,madeby=No,madeinusa=0,manufacture_country=Imported / Other,product_image_size=Default,product_page_type=Default,shopping_ad_bestseller=No,square_product_image=https://square-production.s3.amazonaws.com/files/ba245f25ee1be7f614a81726524313abf4467d6f/original.jpeg,store_price=4.500000,sw_featured=No,sync_update_msg=Modified in Magento by harryepstein on 27/09/2017,url_path=general-tools-195-3-4-3-4-inch-countersink-bit, 01 05 L 02