Two edged screw extractor for damage free screw extraction of broken screwsor threaded bolts from thread drillings adjustable for right hand or left hand thread operation for safe and sure seating just drive into the drill hole nonslip two edged contact made from high quality cv steel bronzed polished cutting surfaces m5 m6 m8 m10 m10 m12 m12 m16 m16 m20 5 piece set sizes 1 to 5 in a pouch