R900 Series 2 blade extended high speed ball knife 2 blade high speed ball knife 2 blade micro-diameter deep groove flat knife 2 blade small diameter ball knife 2 blade small diameter deep groove ball knife 2 blade small diameter flat knife 2-blade small diameter deep groove round nose knife 2-edge micro-diameter deep groove ball knife 4-blade extended high speed round nose knife 4-blade extended high-speed flat knife 4-blade high speed ball knife 4-blade high-speed flat knife 4-blade high-speed round nose knife 4-blade small diameter deep groove flat knife 4-blade small diameter deep groove round nose knife