... quality for 6"~17 1/2" 2.high quality,best price 4.number of blade :4,5,6 ... ,7,8,9,... Specifications1.best quality for 6"~17 1/2" ... 2.high quality,best price 4.number of blade :4,5,6 ... ,7,8,9,... 1,Application:1,Suit for drilling medium to medium ... evacuation requirements with available hydraulic flows.Allows for higher flow rates with minimal increase in ...